Safety Trial of Live Attenuated Influenza (H7N3) Vaccine

• Sponsor: PATH (Other)
• Overall Status: Completed
• CT.gov ID: NCT01511419
• Collaborator: Ministry of Health, Russian Federation (Other), Research Institute of Influenza, Russia (Other), Institute of Experimental Medicine, Russia (Other)
• Enrollment: 40
• Location: 1
• Arms: 2
• Duration (Months): 3
• Patients Per Site Per Month: 13.4

Study Details

Study Description

Brief Summary

The study hypothesis is that two doses of cold-adapted, live monovalent A/17/mallard/Netherlands/00/95 (H7N3) influenza vaccine will be safe and immunogenic in healthy adults.

Condition or Disease	Intervention/Treatment	Phase
Influenza; Avian Influenza	Biological: LAIV H7N3; Biological: placebo	Phase 1

Detailed Description

This is a phase I, double-blind, individually-randomized (3:1, vaccine:placebo), controlled trial with two groups, LAIV H7N3 and matched placebo. Healthy male and female adults 18 through 49 years of age will be invited to participate. For feasibility reasons and in order for an independent Safety Monitoring Committee (SMC) to review safety data in a small group of subjects initially, the total cohort of 40 subjects will be enrolled in two sub-cohorts: one cohort of 12 subjects, randomized at 3:1 (9 vaccine and 3 placebo), followed two weeks later by a second cohort of 28 subjects randomized at 3:1 (21 vaccine and 7 placebo). After all 12 volunteers of the first sub-cohort have been observed for the first isolation period (Day 1 to Day 7), an interim safety review will be performed by the SMC. The SMC will review all adverse events (AEs), including clinical laboratory evaluations (pre- and post-vaccination) and shedding data, for all subjects and will advise if the volunteers of the first sub-cohort may receive dose two of study vaccine or placebo and if the additional 28 volunteers of the second sub-cohort may be enrolled into the study. As for the first sub-cohort, the SMC will also review all safety data for the second sub-cohort and for the entire participant population of the trial. For each sub-cohort, the procedures and timelines are here summarized.

On the day of first screening, about 7 days (between 4 and 14 days) prior to administration of dose one of study vaccine or placebo, subjects will be screened for eligibility through medical history review, physical examination, testing for serologic evidence of chronic viral infection [human immunodeficiency virus (HIV), hepatitis B virus (HBV) or hepatitis C virus (HCV), with proper pre- and post-test counseling], routine biochemical and hematological blood tests and urinalysis by dipstick.

Subject screening for eligibility will continue and be completed on the second screening day (S2). This second screening day will occur the same day as scheduled admission to the isolation unit and administration of study vaccine or placebo (Day 0). Women will undergo pregnancy tests using urine samples. All subjects will undergo an ear, nose and throat (ENT) examination. Fully eligible subjects will be admitted to the isolation unit. At that time, nasal swab, nasal wick, and blood specimens will be collected for virologic and immunological testing prior to administration of study vaccine or placebo. Blood and urine specimens will be again collected for routine biochemical and hematological blood tests and urinalysis by dipstick; these results will serve to define baseline status for subject prior to receipt of study vaccine or placebo but will not be used for screening purposes. Subjects will be unaware of which allocation, LAIV H7N3 or matched placebo, is received; study vaccine and placebo will be masked. Subjects will be carefully monitored for adverse reactions while in the isolation unit.

All subjects will remain in the isolation unit for at least 7 days after receipt of study vaccine or placebo. Nasal swabs will be collected daily while subjects are in isolation to test for presence of influenza virus shed in the nasal passage. Any subject exhibiting conjunctivitis will also have a conjunctival swab collected on the day of appearance of the sign. Any subject exhibiting influenza A virus shedding, as determined by real-time reverse transcriptase polymerase chain reaction (RT-PCR) positivity on a nasal swab specimen, in the 2 days prior to each planned discharge day after each dose (Days 6 or 7 or Days 34 or 35) will be kept in the isolation until PCR-diagnosis results confirm that no influenza virus is present in a tested clinical specimen for at least two consecutive days. Any subject still exhibiting evidence of influenza virus shedding in a nasal swab on Days 6 or 7 or Days 34 or 35 post-administration with each dose might be placed on influenza antiviral (oseltamivir) treatment at the standard dose for treatment of 75 milligrams (mg) twice a day for a course of 5 days.

After discharge from the isolation unit, subjects will complete diary cards for AEs and use of concomitant medications. Subjects will return to the isolation unit at four weeks (Day 28) after administration of dose one of study vaccine or placebo. At that time, similar procedures will be used for admittance to the isolation unit, for receipt of dose two of study vaccine or placebo and for isolation and follow-up, with the additional procedure of review of interim histories (and diary cards) since first discharge after dose one.

After second discharge from the isolation unit, subjects will again complete diary cards for AEs and use of concomitant medications. Subjects will then return to the study center at four weeks (Day 56) after administration of dose two of study vaccine or placebo for their final study visit. Interim histories (and diary cards) will again be reviewed and final blood and nasal wick specimens will be collected. Women will also undergo a final pregnancy screen. Subjects will complete the study at this time.

For assessment of safety, subjects will be observed for two hours after each administration of study vaccine or placebo. Twice daily (early morning and late afternoon) examination will be also used to assess reactions for 7 days after each administration of study vaccine or placebo. ENT examination will also occur once per day on Days 7, 28, 35 and 56. Subjects will complete diary cards for unsolicited AEs from the day of each discharge until return to the isolation unit for dose two (at Day 28) or until return to the study center for the final study visit at four weeks post dose two (at Day 56). To assess safety, blood and urine specimens will also be collected on days 7, 28 (prior to administration of dose two of study vaccine or placebo), 35 and 56, for testing by routine biochemical and hematological blood tests and by urinalysis by dipstick.

For the evaluation of mucosal immunoglobulin A (IgA) antibody, nasal wick specimens will be collected on Day 0 (prior to administration of dose one of study vaccine or placebo), on Day 28 (prior to administration of dose two of study vaccine or placebo) and on Day 56. For the evaluation of serum antibodies (by hemagglutination inhibition [HAI], microneutralization and IgA and immunoglobulin G [IgG] EIA), serum specimens will be collected on Day 0 (prior to administration of dose one of study vaccine or placebo), on Day 28 (prior to administration of dose two of study vaccine or placebo) and on Day 56. To study virus infectivity (by isolation in chicken embryos) and stability (by molecular sequencing of any isolated virus), nasal swab specimens will be taken on Days 1, 2, 3, 5, 7, 29, and 31. To assess priming and stimulation of cytotoxic T lymphocytes and other cytokine indicators, whole blood for isolation of peripheral blood mononuclear cells (PBMCs) will be collected on Days 0 (prior to administration of dose one of study vaccine or placebo), on Day 28 (prior to administration of dose two of study vaccine or placebo) and on Day 56.

Study Design

• Study Type: Interventional
• Actual Enrollment: 40 participants
• Allocation: Randomized
• Intervention Model: Parallel Assignment
• Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
• Primary Purpose: Prevention
• Official Title: Reactogenicity, Safety and Immunogenicity of a Live Monovalent A/17/Mallard/Netherlands/00/95 (H7N3) Influenza Vaccine
• Study Start Date: Apr 1, 2012
• Actual Primary Completion Date: Jun 1, 2012
• Actual Study Completion Date: Jul 1, 2012

Arms and Interventions

Arm	Intervention/Treatment
Experimental: LAIV H7N3 Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log egg infectious dose (EID) 50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol. Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28.	Biological: LAIV H7N3; 2 doses of vaccine; Other Names: A/17/mallard/Netherlands/00/95 (H7N3)
Placebo Comparator: Placebo Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28	Biological: placebo; 2 doses of placebo

Outcome Measures

Primary Outcome Measures

1. Number of Participants With Immediate Reactions [2 hours post-administration on Days 0 and 28]

   From administration of any dose, immediate reaction measured as observed by study staff or reported by the subject to study staff in case of an anaphylactic reaction.

2. Adverse Events Associated With Intranasal Vaccination [Greater than 2 hours through 7 days following any dose]

   From solicited local and systemic reactions

3. All Other Adverse Events [7 days following any dose]

   Including unsolicited events and abnormal laboratory findings

4. Participants With Serious Adverse Events (SAEs) [Within 4 weeks of receipt of any dose]

   Including abnormal laboratory findings

Secondary Outcome Measures

1. Number/Percentage of Subjects With Seroconversion for Serum Hemagglutination Inhibition (HAI) [28 days (Dose 1) and 56 days (Dose 2)]

   Seroconversion was defined as at least a four-fold rise after each dose from baseline or as the mean titer after each dose

2. Number/Percentage of Subjects With Serum Neutralizing Antibodies [28 days (Dose 1) and 56 days (Dose 2)]

   Measured using microneutralization assay. Seroconversion was defined as at least a four-fold rise after each dose from baseline or as the mean titer after each dose

3. Number/Percentage of Subjects With Seroconversion for Serum Immunoglobulin A (IgA) [28 days (Dose 1) and 56 days (Dose 2)]

   Measured by enzyme-linked immunoassay (EIA). Seroconversion was defined as at least a four-fold rise after each dose from baseline or as the mean titer after each dose

4. Number/Percentage of Subjects With Seroconversion for Serum Immunoglobulin G (IgG) [28 days (Dose 1) and 56 days (Dose 2)]

   Measured by enzyme-linked immunoassay (EIA). Seroconversion was defined as at least a four-fold rise after each dose from baseline or as the mean titer after each dose

5. Number/Percentage of Subjects With Seroconversion for Mucosal IgA [28 days (Dose 1) and 56 days (Dose 2)]

   From nasal wick specimen. Seroconversion was defined as at least a four-fold rise after each dose from baseline or as the mean titer after each dose

6. Geometric Mean Titers (GMTs) for Serum Hemagglutination Inhibition (HAI) Antibodies (4 Haemagglutinating Units of H7N3) [0 days, 28 days (Dose 1) and 56 days (Dose 2)]

   HAI test was performed by standard procedure with human red blood cells utilizing either 4 haemagglutinating units (HAU) of H7N3.

7. Geometric Mean Titers (GMTs) for Serum Hemagglutination Inhibition (HAI) Antibodies (2 Haemagglutinating Units of H7N3) [0 days, 28 days (Dose 1) and 56 days (Dose 2)]

   HAI test was performed by standard procedure with human red blood cells utilizing 2 haemagglutinating units (HAU) of H7N3.

8. Geometric Mean Titers (GMTs) for Serum Neutralizing Antibodies [0 days, 28 days (Dose 1) and 56 days (Dose 2)]

   Measured by microneutralization assay

9. Number/Percentage of Vaccinated Subjects Shedding Virus After First Dose [Days 1, 2, 3 & 4]

   Detected by real-time reverse transcriptase polymerase chain reaction (rRTPCR) in nasal swabs or conjunctival swabs or by isolation in chicken embryos.

10. Number/Percentage of Subjects Shedding Virus After Second Dose [Day 29, 30, 31 and 32]

    Detected by real-time reverse transcriptase polymerase chain reaction (rRTPCR) in nasal swabs or conjunctival swabs or by isolation in chicken embryos.

Other Outcome Measures

1. Number/Percentage of Subjects Exhibiting CD4+ IFNγ+ Responses [Days 0, 28 & 56]

   H7N3-specific T cell responses were examined in peripheral blood mononuclear cells (PBMCs) obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.

2. Number/Percentage of Subjects Exhibiting CD4+ IFNγ+ Central Memory T Cell Responses [Days 0, 28 & 56]

   H7N3-specific T cell responses were examined in PBMCs obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.

3. Number/Percentage of Subjects Exhibiting CD4+ IFNγ+ Effector Memory T Cell Responses [Days 0, 28 & 56]

   H7N3-specific T cell responses were examined in PBMCs obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.

4. Number/Percentage of Subjects Exhibiting CD8+ IFNγ+ Responses [Days 0, 28 & 56]

   H7N3-specific T cell responses were examined in PBMCs obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.

5. Number/Percentage of Subjects Exhibiting CD8+ IFNγ+ Central Memory T Cell Responses [Days 0, 28 & 56]

   H7N3-specific T cell responses were examined in PBMCs obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.

6. Number/Percentage of Subjects Exhibiting CD8+ IFNγ+ Effector Memory T Cell Responses [Days 0, 28 & 56]

   H7N3-specific T cell responses were examined in PBMCs obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.

Eligibility Criteria

Criteria

• Ages Eligible for Study: 18 Years to 49 Years
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: Yes

Inclusion Criteria:

• Legal male or female adult 18 through 49 years of age at the enrollment visit.

• Literate and willing to provide written informed consent.

• Free of obvious health problems, as established by the medical history and screening evaluations, including physical examination.

• Capable and willing to complete diary cards and willing to return for all follow-up visits

• Willing to comply with the rules of the isolation unit (including willing and able to take oseltamivir influenza antiviral medication, should that be recommended by a study physician).

• For females, willing to take reliable birth control measures throughout the entire period of participation in the study.

Exclusion Criteria:

• Participation in another clinical trial involving any therapy within the previous three months or planned enrollment in such a trial during the period of this study.

• Receipt of any non-study vaccine within four weeks prior to enrollment or refusal to postpone receipt of such vaccines until four weeks after study completion.

• Practice of nasal irrigation on a regular basis within the past six months or has engaged in nasal irrigation within two weeks prior to enrollment.

• Recent history of frequent nose bleeds (>5 within the past year).

• Clinically relevant abnormal paranasal anatomy.

• Recent history (within the past month) of rhino or sinus surgery, or surgery for any traumatic injury of the nose.

• Current or recent (within two weeks of enrollment) acute respiratory illness with or without fever.

• Other acute illness at the time of study enrollment.

• Receipt of immune globulin or other blood products within three months prior to study enrollment or planned receipt of such products during the period of subject participation in the study.

• Chronic administration (defined as more than 14 consecutively-prescribed days) of immunosuppressants or other immune-modulating therapy within six months prior to study enrollment. (For corticosteroids, this means prednisone or equivalent, >=0.5 mg per kg per day; topical steroids are allowed, exclusive of nasal.)

• Participation in any previous trial of any H5 or H7 containing influenza vaccine.

• History of asthma.

• Hypersensitivity after previous administration of any influenza vaccine.

• History of wheezing after past receipt of any live influenza vaccine.

• Other AE following immunization, at least possibly related to previous receipt of any influenza vaccine.

• Suspected or known hypersensitivity to any of the study vaccine components, including chicken or egg protein.

• Seasonal (autumnal) hypersensitivity to the natural environment.

• Acute or chronic clinically significant pulmonary, cardiovascular, hepatic, metabolic, neurologic, psychiatric or renal functional abnormality, as determined by medical history, physical examination or clinical laboratory screening tests, which in the opinion of the investigator, might interfere with the study objectives. Subjects with physical examination findings or clinical laboratory screening results which would be graded 2 or higher on the AE severity grading scale will be excluded from entry into the study and will be excluded from receipt of dose two of study vaccine or placebo.

• History of leukemia or any other blood or solid organ cancer.

• History of thrombocytopenic purpura or known bleeding disorder.

• History of seizures.

• Known or suspected immunosuppressive or immunodeficient condition of any kind, including HIV infection.

• Known chronic HBV or HCV infection.

• Known tuberculosis infection or evidence of previous tuberculosis exposure.

• History of chronic alcohol abuse and/or illegal drug use.

• Claustrophobia or sociophobia.

• Pregnancy or lactation. (A negative pregnancy test will be required before administration of study vaccine or placebo for all women of childbearing potential.)

• Any condition that, in the opinion of the investigator, would increase the health risk to the subject if he/she participates in the study or would interfere with the evaluation of the study objectives.

Contacts and Locations

Locations

	Site	City	State	Country	Postal Code
1	Research Institute of Influenza	St Petersburg		Russian Federation	197376

Sponsors and Collaborators

• PATH
• Ministry of Health, Russian Federation
• Research Institute of Influenza, Russia
• Institute of Experimental Medicine, Russia

Investigators

• Principal Investigator: Oleg I Kiselev, MD, PhD, DSc, Research Institute of Influenza
• Study Director: Larisa G Rudenko, MD, PhD, DSc, Institute of Experimental Medicine
• Study Director: Kathleen M Neuzil, MD, MPH, PATH Vaccine Solutions
• Study Director: Igor Victorevich, Microgen

Study Documents (Full-Text)

None provided.

More Information

Publications

None provided.

• Responsible Party: PATH
• ClinicalTrials.gov Identifier: NCT01511419
• Other Study ID Numbers: LAIV-H7N3-01
• First Posted: Jan 18, 2012
• Last Update Posted: Apr 22, 2019
• Last Verified: Jan 1, 2019

• Keywords provided by PATH: Influenza; Vaccine; Pandemic; H7N3
• Additional relevant MeSH terms: Influenza, Human; Influenza in Birds

Study Results

Participant Flow

Arm/Group Title	LAIV H7N3	Placebo
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log egg infectious dose (EID) 50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol. Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28 placebo: 2 doses of placebo
Period Title: Dose 1
STARTED	30	10
COMPLETED	30	10
NOT COMPLETED	0	0
Period Title: Dose 1
STARTED	30	10
COMPLETED	29	10
NOT COMPLETED	1	0

Baseline Characteristics

Arm/Group Title	LAIV H7N3	Placebo	Total
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol. Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28. LAIV H7N3: 2 doses of vaccine	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28 placebo: 2 doses of placebo	Total of all reporting groups
Overall Participants	30	10	40
Age (years) [Mean (Standard Deviation) ]
Mean (Standard Deviation) [years]	30.1 (10.3)	38.5 (9.7)	32.2 (10.7)
Sex: Female, Male (Count of Participants)
Female	15 50%	4 40%	19 47.5%
Male	15 50%	6 60%	21 52.5%

Outcome Measures

1. Primary Outcome

Title	Number of Participants With Immediate Reactions
Description	From administration of any dose, immediate reaction measured as observed by study staff or reported by the subject to study staff in case of an anaphylactic reaction.
Time Frame	2 hours post-administration on Days 0 and 28

Outcome Measure Data

Analysis Population Description

Intent-to-treat (ITT) population

Arm/Group Title	LAIV H7N3: Dose 1 (Day 0)	Placebo: Dose 1 (Day 0)	LAIV H7N3: Dose 2 (Day 28)	Placebo: Dose 2 (Day 28)
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	30	10	29	10
Immediate reaction	0 0%	0 0%	0 0%	0 NaN
No immediate reaction	30 100%	10 100%	29 72.5%	10 NaN

2. Primary Outcome

Title	Adverse Events Associated With Intranasal Vaccination
Description	From solicited local and systemic reactions
Time Frame	Greater than 2 hours through 7 days following any dose

Outcome Measure Data

Analysis Population Description

Intent-To-Treat (ITT) Population

Arm/Group Title	LAIV H7N3: Dose 1	Placebo: Dose 1	LAIV H7N3: Dose 2	Placebo: Dose 2
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	30	10	29	10
Any local or systemic reaction	11 36.7%	4 40%	5 12.5%	1 NaN
No local or systemic reaction	19 63.3%	6 60%	24 60%	9 NaN

3. Primary Outcome

Title	All Other Adverse Events
Description	Including unsolicited events and abnormal laboratory findings
Time Frame	7 days following any dose

Outcome Measure Data

Analysis Population Description

Total events among Intent-To-Treat (ITT) Population

Arm/Group Title	LAIV H7N3: Dose 1	Placebo: Dose 1	LAIV H7N3: Dose 2	Placebo: Dose 2
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	30	10	29	10
Measure adverse events	44	6	90	21
Unrelated	40	6	84	20
Related	4	0	6	1

4. Primary Outcome

Title	Participants With Serious Adverse Events (SAEs)
Description	Including abnormal laboratory findings
Time Frame	Within 4 weeks of receipt of any dose

Outcome Measure Data

Analysis Population Description

Intent-To-Treat (ITT) Population

Arm/Group Title	LAIV H7N3: Dose 1	Placebo: Dose 1	LAIV H7N3: Dose 2	Placebo: Dose 2
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	30	10	29	10
Any serious adverse event	0 0%	0 0%	0 0%	0 NaN
No serious adverse event	30 100%	10 100%	29 72.5%	10 NaN

5. Secondary Outcome

Title	Number/Percentage of Subjects With Seroconversion for Serum Hemagglutination Inhibition (HAI)
Description	Seroconversion was defined as at least a four-fold rise after each dose from baseline or as the mean titer after each dose
Time Frame	28 days (Dose 1) and 56 days (Dose 2)

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) Population

Arm/Group Title	LAIV H7N3: Dose 1	Placebo: Dose 1	LAIV H7N3: Dose 2	Placebo: Dose 2
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10
Seroconversion	3 10%	0 0%	9 22.5%	0 NaN
No seroconversion	26 86.7%	10 100%	20 50%	10 NaN

6. Secondary Outcome

Title	Number/Percentage of Subjects With Serum Neutralizing Antibodies
Description	Measured using microneutralization assay. Seroconversion was defined as at least a four-fold rise after each dose from baseline or as the mean titer after each dose
Time Frame	28 days (Dose 1) and 56 days (Dose 2)

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) Population

Arm/Group Title	LAIV H7N3: Dose 1	Placebo: Dose 1	LAIV H7N3: Dose 2	Placebo: Dose 2
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10
Seroconversion	5 16.7%	0 0%	12 30%	0 NaN
No seroconversion	24 80%	10 100%	17 42.5%	10 NaN

7. Secondary Outcome

Title	Number/Percentage of Subjects With Seroconversion for Serum Immunoglobulin A (IgA)
Description	Measured by enzyme-linked immunoassay (EIA). Seroconversion was defined as at least a four-fold rise after each dose from baseline or as the mean titer after each dose
Time Frame	28 days (Dose 1) and 56 days (Dose 2)

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) Population

Arm/Group Title	LAIV H7N3: Dose 1	Placebo: Dose 1	LAIV H7N3: Dose 2	Placebo: Dose 2
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10
Seroconversion	3 10%	0 0%	8 20%	0 NaN
No seroconversion	26 86.7%	10 100%	21 52.5%	10 NaN

8. Secondary Outcome

Title	Number/Percentage of Subjects With Seroconversion for Serum Immunoglobulin G (IgG)
Description	Measured by enzyme-linked immunoassay (EIA). Seroconversion was defined as at least a four-fold rise after each dose from baseline or as the mean titer after each dose
Time Frame	28 days (Dose 1) and 56 days (Dose 2)

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) Population

Arm/Group Title	LAIV H7N3: Dose 1	Placebo: Dose 1	LAIV H7N3: Dose 2	Placebo: Dose 2
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10
Seroconversion	1 3.3%	0 0%	3 7.5%	0 NaN
No seroconversion	28 93.3%	10 100%	26 65%	10 NaN

9. Secondary Outcome

Title	Number/Percentage of Subjects With Seroconversion for Mucosal IgA
Description	From nasal wick specimen. Seroconversion was defined as at least a four-fold rise after each dose from baseline or as the mean titer after each dose
Time Frame	28 days (Dose 1) and 56 days (Dose 2)

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) Population

Arm/Group Title	LAIV H7N3: Dose 1	Placebo: Dose 1	LAIV H7N3: Dose 2	Placebo: Dose 2
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10
Seroconversion	12 40%	1 10%	12 30%	1 NaN
No seroconversion	17 56.7%	9 90%	17 42.5%	9 NaN

10. Secondary Outcome

Title	Geometric Mean Titers (GMTs) for Serum Hemagglutination Inhibition (HAI) Antibodies (4 Haemagglutinating Units of H7N3)
Description	HAI test was performed by standard procedure with human red blood cells utilizing either 4 haemagglutinating units (HAU) of H7N3.
Time Frame	0 days, 28 days (Dose 1) and 56 days (Dose 2)

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) Population

Arm/Group Title	LAIV H7N3	Placebo
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol. Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28. LAIV H7N3: 2 doses of vaccine	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28 placebo: 2 doses of placebo
Measure Participants	29	10
Day 0	2.8	3.3
Day 28	3.5	3.3
Day 56	4.7	3.5

11. Secondary Outcome

Title	Geometric Mean Titers (GMTs) for Serum Hemagglutination Inhibition (HAI) Antibodies (2 Haemagglutinating Units of H7N3)
Description	HAI test was performed by standard procedure with human red blood cells utilizing 2 haemagglutinating units (HAU) of H7N3.
Time Frame	0 days, 28 days (Dose 1) and 56 days (Dose 2)

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) population

Arm/Group Title	LAIV H7N3	Placebo
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol. Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28. LAIV H7N3: 2 doses of vaccine	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28 placebo: 2 doses of placebo
Measure Participants	29	10
Day 0	3.0	4.1
Day 28	5.5	4.1
Day 56	7	4.7

12. Secondary Outcome

Title	Geometric Mean Titers (GMTs) for Serum Neutralizing Antibodies
Description	Measured by microneutralization assay
Time Frame	0 days, 28 days (Dose 1) and 56 days (Dose 2)

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) population

Arm/Group Title	LAIV H7N3	Placebo
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol. Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28. LAIV H7N3: 2 doses of vaccine	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol Duration of treatment: Two doses were delivered, one on Day 0 and one on Day 28 placebo: 2 doses of placebo
Measure Participants	29	10
Day 0	4.2	4.4
Day 28	6.2	4.4
Day 56	12.4	5.0

13. Secondary Outcome

Title	Number/Percentage of Vaccinated Subjects Shedding Virus After First Dose
Description	Detected by real-time reverse transcriptase polymerase chain reaction (rRTPCR) in nasal swabs or conjunctival swabs or by isolation in chicken embryos.
Time Frame	Days 1, 2, 3 & 4

Outcome Measure Data

Analysis Population Description

Intent-To-Treat (ITT) Population

Arm/Group Title	Day 1	Day 2	Day 3	Day 4
Arm/Group Description	LAIV H7N3 Arm	LAIV H7N3 Arm	LAIV H7N3 Arm	LAIV H7N3 Arm
Measure Participants	30	30	30	30
Shedding	18 60%	3 30%	1 2.5%	0 NaN
No shedding	12 40%	27 270%	29 72.5%	30 NaN

14. Secondary Outcome

Title	Number/Percentage of Subjects Shedding Virus After Second Dose
Description	Detected by real-time reverse transcriptase polymerase chain reaction (rRTPCR) in nasal swabs or conjunctival swabs or by isolation in chicken embryos.
Time Frame	Day 29, 30, 31 and 32

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) Population

Arm/Group Title	Day 29	Day 30	Day 31	Day 32
Arm/Group Description	LAIV H7N3 Arm	LAIV H7N3 Arm	LAIV H7N3 Arm	LAIV H7N3 Arm
Measure Participants	29	29	29	29
Shedding	14 46.7%	2 20%	1 2.5%	0 NaN
No shedding	15 50%	27 270%	28 70%	29 NaN

15. Other Pre-specified Outcome

Title	Number/Percentage of Subjects Exhibiting CD4+ IFNγ+ Responses
Description	H7N3-specific T cell responses were examined in peripheral blood mononuclear cells (PBMCs) obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.
Time Frame	Days 0, 28 & 56

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) population that received 2 doses of either vaccine or placebo

Arm/Group Title	LAIV H7N3: Day 0 (After Dose 1)	Placebo: Day 0 (After Dose 1)	LAIV H7N3: Day 28 (Dose 2)	Placebo: Day 28 (Dose 2)	LAIV H7N3: Day 56 (28 Days Past Dose 2)	Placebo: Day 56 (28 Days Past Dose 2)
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10	29	10
Positive response	2 6.7%	0 0%	3 7.5%	0 NaN	4 NaN	0 NaN
No response	27 90%	10 100%	26 65%	10 NaN	25 NaN	10 NaN

16. Other Pre-specified Outcome

Title	Number/Percentage of Subjects Exhibiting CD4+ IFNγ+ Central Memory T Cell Responses
Description	H7N3-specific T cell responses were examined in PBMCs obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.
Time Frame	Days 0, 28 & 56

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) population that received 2 doses of either vaccine or placebo

Arm/Group Title	LAIV H7N3: Day 0 (After Dose 1)	Placebo: Day 0 (After Dose 1)	LAIV H7N3: Day 28 (Dose 2)	Placebo: Day 28 (Dose 2)	LAIV H7N3: Day 56 (28 Days Past Dose 2)	Placebo: Day 56 (28 Days Past Dose 2)
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10	29	10
Positive response	5 16.7%	0 0%	6 15%	0 NaN	7 NaN	0 NaN
No response	24 80%	10 100%	23 57.5%	10 NaN	22 NaN	10 NaN

17. Other Pre-specified Outcome

Title	Number/Percentage of Subjects Exhibiting CD4+ IFNγ+ Effector Memory T Cell Responses
Description	H7N3-specific T cell responses were examined in PBMCs obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.
Time Frame	Days 0, 28 & 56

Outcome Measure Data

Analysis Population Description

[Not Specified]

Arm/Group Title	LAIV H7N3: Dose 1 (Day 0)	Placebo: Dose 1 (Day 0)	LAIV H7N3: Day 28 (Dose 2)	Placebo: Day 28 (Dose 2)	LAIV H7N3: Day 56 (28 Days Past Dose 2)	Placebo: Day 56 (28 Days Past Dose 2)
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10	29	10
Positive response	1 3.3%	0 0%	3 7.5%	0 NaN	3 NaN	0 NaN
No response	28 93.3%	10 100%	26 65%	10 NaN	26 NaN	10 NaN

18. Other Pre-specified Outcome

Title	Number/Percentage of Subjects Exhibiting CD8+ IFNγ+ Responses
Description	H7N3-specific T cell responses were examined in PBMCs obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.
Time Frame	Days 0, 28 & 56

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) population that received 2 doses of either vaccine or placebo

Arm/Group Title	LAIV H7N3: Dose 1 (Day 0)	Placebo: Dose 1 (Day 0)	LAIV H7N3: Day 28 (Dose 2)	Placebo: Day 28 (Dose 2)	LAIV H7N3: Day 56 (28 Days Past Dose 2)	Placebo: Day 56 (28 Days Past Dose 2)
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10	29	10
Positive response	0 0%	0 0%	5 12.5%	0 NaN	5 NaN	0 NaN
No response	29 96.7%	10 100%	24 60%	10 NaN	24 NaN	10 NaN

19. Other Pre-specified Outcome

Title	Number/Percentage of Subjects Exhibiting CD8+ IFNγ+ Central Memory T Cell Responses
Description	H7N3-specific T cell responses were examined in PBMCs obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.
Time Frame	Days 0, 28 & 56

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) population that received 2 doses of either vaccine or placebo

Arm/Group Title	LAIV H7N3: Dose 1 (Day 0)	Placebo: Dose 1 (Day 0)	LAIV H7N3: Day 28 (Dose 2)	Placebo: Day 28 (Dose 2)	LAIV H7N3: Day 56 (28 Days Past Dose 2)	Placebo: Day 56 (28 Days Past Dose 2)
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10	29	10
Positive response	1 3.3%	0 0%	6 15%	0 NaN	6 NaN	0 NaN
No response	28 93.3%	10 100%	23 57.5%	10 NaN	23 NaN	10 NaN

20. Other Pre-specified Outcome

Title	Number/Percentage of Subjects Exhibiting CD8+ IFNγ+ Effector Memory T Cell Responses
Description	H7N3-specific T cell responses were examined in PBMCs obtained from all the study subjects before vaccination (Day 0), 28 days after the first vaccination (Day 28) and 28 days after revaccination (Day 56). To calculate the frequency of virus-specific T cells we quantified all cells positive for IFNγ after in vitro stimulation with whole H7N3 virion. Increases in the antigen-specific CD4+T-cell levels exceeding 3 standard deviations from the levels in the mean of the placebo were considered positive responses.
Time Frame	Days 0, 28 & 56

Outcome Measure Data

Analysis Population Description

Per-Protocol (PP) population that received 2 doses of either vaccine or placebo

Arm/Group Title	LAIV H7N3: Dose 1 (Day 0)	Placebo: Dose 1 (Day 0)	LAIV H7N3: Day 28 (Dose 2)	Placebo: Day 28 (Dose 2)	LAIV H7N3: Day 56 (28 Days Past Dose 2)	Placebo: Day 56 (28 Days Past Dose 2)
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.	Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
Measure Participants	29	10	29	10	29	10
Positive response	0 0%	0 0%	5 12.5%	0 NaN	5 NaN	0 NaN
No response	29 96.7%	10 100%	24 60%	10 NaN	24 NaN	10 NaN

Adverse Events

Time Frame	Up to 56 days following dosing
Adverse Event Reporting Description	For the assessment of safety, subjects were assessed for adverse reactions twice daily (early morning and late afternoon) for 7 days. An ear, nose, and throat (ENT) examination was performed on Days 7, 28, 35, and 56. Blood and urine specimens were also collected on Days 7, 28 (prior to administration of the second dose of study vaccine or placebo), 35 and 56, for testing by routine biochemical and hematological blood tests and by urinalysis by dipstick.
Arm/Group Title	LAIV H7N3: Dose 1		Placebo: Dose 1		LAIV H7N3: Dose 2		Placebo: Dose 2
Arm/Group Description	Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.		Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol		Test drug/agent: Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine (LAIV H7N3) grown in embryonated chicken eggs. Name of active ingredient(s): Live-attenuated A/17/mallard/Netherlands/00/95 influenza vaccine. Dose: ≥7.5 log EID50/0.5 ml dose; 0.25 ml/nare. Route of administration: Intranasal aerosol.		Reference drug: Placebo; saline inoculated in embryonated chicken eggs and subsequently prepared in the same way as test vaccine. Dose: 0.5 ml; 0.25 ml/nare Route of administration: Intranasal aerosol
All Cause Mortality
	LAIV H7N3: Dose 1		Placebo: Dose 1		LAIV H7N3: Dose 2		Placebo: Dose 2
	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events
Total	0/30 (0%)		0/10 (0%)		0/30 (0%)		0/10 (0%)
Serious Adverse Events
	LAIV H7N3: Dose 1		Placebo: Dose 1		LAIV H7N3: Dose 2		Placebo: Dose 2
	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events
Total	0/30 (0%)		0/10 (0%)		0/30 (0%)		0/10 (0%)
Other (Not Including Serious) Adverse Events
	LAIV H7N3: Dose 1		Placebo: Dose 1		LAIV H7N3: Dose 2		Placebo: Dose 2
	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events
Total	20/30 (66.7%)		5/10 (50%)		25/30 (83.3%)		8/10 (80%)
Blood and lymphatic system disorders
Lymphocytosis	2/30 (6.7%)		0/10 (0%)		1/30 (3.3%)		1/10 (10%)
Monocytosis	1/30 (3.3%)		0/10 (0%)		1/30 (3.3%)		0/10 (0%)
Neutropenia	1/30 (3.3%)		0/10 (0%)		1/30 (3.3%)		1/10 (10%)
Infections and infestations
Nasopharyngitis	0/30 (0%)	0	0/10 (0%)	0	1/30 (3.3%)	0	0/10 (0%)	0
Respiratory tract infection viral	0/30 (0%)	0	0/10 (0%)	0	1/30 (3.3%)	0	0/10 (0%)	0
Investigations
Blood alkaline phosphatase decreased	0/30 (0%)		1/10 (10%)		0/30 (0%)		2/10 (20%)
Blood alkaline phosphatase increased	1/30 (3.3%)		0/10 (0%)		1/30 (3.3%)		0/10 (0%)
Blood bicarbonate increased	9/30 (30%)		3/10 (30%)		5/30 (16.7%)		3/10 (30%)
Blood bilirubin increased	5/30 (16.7%)		0/10 (0%)		2/30 (6.7%)		0/10 (0%)
Blood calcium increased	1/30 (3.3%)		0/10 (0%)		3/30 (10%)		1/10 (10%)	1
Blood chloride increased	2/30 (6.7%)		1/10 (10%)		3/30 (10%)		1/10 (10%)
Blood creatinine increased	1/30 (3.3%)		0/10 (0%)		6/30 (20%)		0/10 (0%)
Eosinophil count increased	1/30 (3.3%)		0/10 (0%)		1/30 (3.3%)		0/10 (0%)	0
Hemoglobin increased	1/30 (3.3%)		0/10 (0%)		4/30 (13.3%)		0/10 (0%)
Lymphocyte count decreased	1/30 (3.3%)		0/10 (0%)		2/30 (6.7%)		1/10 (10%)
Lymphocyte count increased	6/30 (20%)		0/10 (0%)		6/30 (20%)		1/10 (10%)
Mean cell hemoglobin concentration increased	1/30 (3.3%)		0/10 (0%)		0/30 (0%)		0/10 (0%)
Monocyte count increased	5/30 (16.7%)		0/10 (0%)		5/30 (16.7%)		3/10 (30%)
Neutrophil count decreased	4/30 (13.3%)		0/10 (0%)		5/30 (16.7%)		0/10 (0%)
White blood cell count increased	2/30 (6.7%)		0/10 (0%)		2/30 (6.7%)		0/10 (0%)
Alanine aminotransferase increased	0/30 (0%)	0	0/10 (0%)	0	2/30 (6.7%)	0	0/10 (0%)	0
Aspartate aminotransferase increased	0/30 (0%)	0	0/10 (0%)	0	1/30 (3.3%)	1	1/10 (10%)	1
Blood glucose increased	0/30 (0%)	0	0/10 (0%)	0	5/30 (16.7%)	0	2/10 (20%)	0
Hemoglobin decreased	0/30 (0%)	0	0/10 (0%)	0	1/30 (3.3%)	0	0/10 (0%)	0
Platelet count increased	0/30 (0%)	0	0/10 (0%)	0	1/30 (3.3%)	0	0/10 (0%)	0
Red blood cell increased	0/30 (0%)		0/10 (0%)		1/30 (3.3%)		0/10 (0%)
Red blood cell sedimentation rate increased	0/30 (0%)		0/10 (0%)		2/30 (6.7%)		1/10 (10%)
Urine leukocyte esterase positive	0/30 (0%)		0/10 (0%)		1/30 (3.3%)		0/10 (0%)
Renal and urinary disorders
Leukocyturia	0/30 (0%)		1/10 (10%)		0/30 (0%)		0/10 (0%)

Limitations/Caveats

Study was completed as expected.

More Information

Certain Agreements

Principal Investigators are NOT employed by the organization sponsoring the study.

There is NOT an agreement between Principal Investigators and the Sponsor (or its agents) that restricts the PI's rights to discuss or publish trial results after the trial is completed.