A Phase 2 Study to Evaluate Immune Responses of FluMist®

Phase 2

Completed

Conditions: Influenza Vaccine

Interventions: Biological: FluMist, Influenza Virus Vaccine Live
Biological: TIV, Trivalent Inactivated Influenza Virus Vaccine

Registration Number: NCT00461981

Lead Sponsor: MedImmune LLC

Brief Summary: The primary objective of this study is to describe the level of serum antibody and cellular immune responses conferred by FluMist and TIV against influenza virus strains.

Detailed Description: The primary objective of this study is to describe the level of serum antibody and cellular immune responses conferred by FluMist and TIV against antigenically matched and antigenically mismatched influenza virus strains.

The secondary objective of this study is to describe the safety of FluMist and TIV in subjects 12 to \<36 months of age.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 101

Inclusion Criteria

Male or female aged 12 to <36 months (reached their 1st year but not yet reached their 3rd year birthday) at the time of randomization
Written informed consent and HIPAA authorization obtained from the subject's legal representative
Ability of the subject's legal representative to understand and comply with the requirements of the study
Subject's legal representative available by telephone
Ability to complete follow-up period of 180 days after final study vaccination as required by the protocol

Exclusion Criteria

History of hypersensitivity to any component of FluMist or TIV, including egg or egg products
History of hypersensitivity to gentamicin
Any known immunosuppressive condition or immune deficiency disease (including HIV infection), or ongoing receipt of any immunosuppressive therapy
Household contact who is immunocompromised (participants should also avoid close contact with immunocompromised individuals for at least 21 days after each study vaccination)
History of Guillain-Barré syndrome
Any prior history of wheezing or asthma
Acute febrile (≥100.0°F oral or equivalent) and/or clinically significant respiratory illness (e.g., cough or sore throat) within 72 hours prior to either study vaccination
Use of aspirin or aspirin-containing products within the 30 days prior to randomization, or expected receipt through 180 days after final study vaccination
Receipt of any prior influenza vaccine
Use of anti-influenza medications (including amantadine, rimantadine, oseltamivir, and zanamivir) within 14 days prior to randomization, or expected receipt through 35 days after final study vaccination
Administration of any live virus vaccine, other than measles, mumps, rubella, and varicella-containing vaccine(s), within 30 days prior to randomization, or expected receipt through 30 days after final study vaccination
Administration of any inactivated (i.e., non-live) vaccine within 14 days prior to randomization, or expected receipt within 14 days before or 14 days after either study vaccination
Receipt of any investigational agent within 30 days prior to randomization, or expected receipt through 180 days after final study vaccination (use of licensed agents for indications not listed in the package insert is permitted)
Receipt of any blood product within 90 days prior to randomization, or expected receipt through 35 days after final study vaccination
Family member or household contact who is an employee of the research center or otherwise involved with the conduct of the study
Any condition that in the opinion of the investigator would interfere with evaluation of the vaccine or interpretation of study results

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
FluMist, Influenza Virus Vaccine Live	FluMist, Influenza Virus Vaccine Live	FluMist, Influenza Virus Vaccine Live, Intranasal
TIV, Trivalent Inactivated Influenza Virus Vaccine	TIV, Trivalent Inactivated Influenza Virus Vaccine	TIV, Trivalent Inactivated Influenza Virus Vaccine, Intramuscular

Primary Outcome Measures

Name	Time	Method
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - H1N1 /wt A/New Caledonia/20/99 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /wt A/New Caledonia/20/99 antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Hemagglutination Inhibition (HAI)Seroconversion Following the First Dose - H1N1 /ca A/New Caledonia/20/99 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /ca A/New Caledonia/20/99 antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Hemagglutination Inhibition (HAI) Seroconversion Following the Second Dose - B /wt B/Malaysia/2506/04 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the B /wt B/Malaysia/2506/04 antigenically matched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - H1N1 /wt A/New Caledonia/20/99 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2)for the H1N1 /wt A/New Caledonia/20/99 antigenically matched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - H1N1 /ca A/New Caledonia/20/99 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /ca A/New Caledonia/20/99 antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Hemagglutination Inhibition (HAI) Seroconversion Following the Second Dose - H1N1 /wt A/New Caledonia/20/99 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /wt A/New Caledonia/20/99 antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Hemagglutination Inhibition (HAI)Seroconversion Following the Second Dose - H1N1 /ca A/New Caledonia/20/99 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /ca A/New Caledonia/20/99 antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Hemagglutination Inhibition (HAI) Seroconversion Following the Second Dose - H3N2 /wt A/Wisconsin/67/05 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H3N2 /wt A/Wisconsin/67/05 antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Hemagglutination Inhibition (HAI) Seroconversion Following the First Dose - B /wt B/Malaysia/2506/04 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the B /wt B/Malaysia/2506/04 antigenically matched influenza strain
Percentage of Subjects With Antigenically Mismatched Strain-specific Hemagglutination Inhibition (HAI) Seroconversion Following the First Dose - H1N1 /wt A/Solomon Island/3/06 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /wt A/Solomon Island/3/06 antigenically mismatched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - H1N1 /ca A/New Caledonia/20/99 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /ca A/New Caledonia/20/99 antigenically matched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - B /wt B/Malaysia/2506/04 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the B /wt B/Malaysia/2506/04 Influenza Strain antigenically matched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - H1N1 /wt A/Solomon Island/3/06 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /wt A/Solomon Island/3/06 Influenza Strain antigenically mismatched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Hemagglutination Inhibition (HAI)Seroconversion Following the First Dose - H1N1 /wt A/New Caledonia/20/99 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /wt A/New Caledonia/20/99 antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Hemagglutination Inhibition (HAI)Seroconversion Following the First Dose - H3N2 /wt A/Wisconsin/67/05 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H3N2 /wt A/Wisconsin/67/05 antigenically matched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - B /wt B/Malaysia/2506/04 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the B /wt B/Malaysia/2506/04 Influenza Strain antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Microneutralization Seroconversion Following the First Dose - H1N1 /wt A/New Caledonia/20/99 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /wt A/New Caledonia/20/99 antigenically matched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - H1N1 /wt A/New Caledonia/20/99 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /wt A/New Caledonia/20/99 antigenically matched influenza strain
Percentage of Subjects With Antigenically Mismatched Strain-specific Hemagglutination Inhibition (HAI) Seroconversion Following the Second Dose - H1N1 /wt A/Solomon Island/3/06 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /wt A/Solomon Island/3/06 antigenically mismatched influenza strain
Percentage of Subjects With Antigenically Mismatched Strain-specific Hemagglutination Inhibition (HAI) Seroconversion Following the First Dose - H3N2 /wt A/Brisbane/10/2007 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H3N2 /wt A/Brisbane/10/2007 antigenically mismatched influenza strain
Percentage of Subjects With Antigenically Mismatched Strain-specific Hemagglutination Inhibition (HAI) Seroconversion Following the Second Dose - H3N2 /wt A/Brisbane/10/2007 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H3N2 /wt A/Brisbane/10/2007 antigenically mismatched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - H3N2 /wt A/Wisconsin/67/05 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H3N2 /wt A/Wisconsin/67/05 Influenza Strain antigenically matched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - H3N2 /wt A/Wisconsin/67/05 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H3N2 /wt A/Wisconsin/67/05 Influenza Strain antigenically matched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - H1N1 /wt A/Solomon Island/3/06 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /wt A/Solomon Island/3/06 Influenza Strain antigenically mismatched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - H3N2 /wt A/Brisbane/10/2007 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H3N2 /wt A/Brisbane/10/2007 Influenza Strain antigenically mismatched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Microneutralization Seroconversion Following the First Dose - H3N2 /wt A/Wisconsin/67/05 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H3N2 /wt A/Wisconsin/67/05 antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Microneutralization Seroconversion Following the First Dose - B /wt B/Malaysia/2506/04 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the B /wt B/Malaysia/2506/04 antigenically matched influenza strain
Hemagglutination Inhibition (HAI) Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - H3N2 /wt A/Brisbane/10/2007 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The HAI GMTs of baseline seronegative subjects (baseline titer of 4 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H3N2 /wt A/Brisbane/10/2007 Influenza Strain antigenically mismatched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Microneutralization Seroconversion Following the Second Dose - B /wt B/Malaysia/2506/04 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the B /wt B/Malaysia/2506/049 antigenically matched influenza strain
Percentage of Subjects With Antigenically Mismatched Strain-specific Microneutralization Seroconversion Following the First Dose - H3N2 /wt A/Brisbane/10/2007 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H3N2 /wt A/Brisbane/10/2007 antigenically mismatched influenza strain
Percentage of Subjects With Antigenically Mismatched Strain-specific Microneutralization Seroconversion Following the Second Dose - H3N2 /wt A/Brisbane/10/2007 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H3N2 /wt A/Brisbane/10/2007 antigenically mismatched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - B /wt B/Malaysia/2506/04 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the B /wt B/Malaysia/2506/049 antigenically matched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - H1N1 /wt A/Solomon Island/3/06 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /wt A/Solomon Island/3/06 antigenically mismatched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - H3N2 /wt A/Brisbane/10/2007 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H3N2 /wt A/Brisbane/10/2007 antigenically mismatched influenza strain
Immunogenicity Response by B-cell IgG and IgA ELISPOT Assay	Post Dose 2 (7 to 10 days post Dose 2)	Counts of antibody secreting cells (ASCs) per 10\^6 peripheral blood mononuclear cells (PBMCs) for influenza-specific response (ie, anti-IgG fluorescein \[FLU\] or anti-IgA FLU) and influenza-specific response after adjusting plate background response (ie, anti-IgG FLU/anti-IgG total or anti-IgA FLU/anti-IgA total) as measured by B-cell ELISPOT assay at 7 to 10 days after Dose 2
Percentage of Subjects With Antigenically Matched Strain-specific Microneutralization Seroconversion Following the Second Dose - H1N1 /wt A/New Caledonia/20/99 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /wt A/New Caledonia/20/99 antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Microneutralization Seroconversion Following the First Dose - H1N1 /ca A/New Caledonia/20/99 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /ca A/New Caledonia/20/99 antigenically matched influenza strain
Percentage of Subjects With Antigenically Mismatched Strain-specific Microneutralization Seroconversion Following the Second Dose - H1N1 /wt A/Solomon Island/3/06 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /wt A/Solomon Island/3/06 antigenically mismatched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - H1N1 /wt A/New Caledonia/20/99 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /wt A/New Caledonia/20/99 antigenically matched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - H1N1 /ca A/New Caledonia/20/99 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /ca A/New Caledonia/20/999 antigenically matched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - B /wt B/Malaysia/2506/04 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the B /wt B/Malaysia/2506/04 antigenically matched influenza strain
Median Fold-Rises in the Number of Interferon-gamma Elispots Per 200,000 Peripheral Blood Mononuclear Cells (PBMCs) by T-cell Elispot Assay	Post Dose 2 (28 to 35 days post Dose 2)	Median number of PBMCs secreting interferon-gamma as measured by the number of spot forming cells per 200,000 PBMCs (SPC/2 x 10\^5 PBMCs) as measured by the T-cell Elispot assay at 28 to 35 days after Dose 2. The results were summarized for wild-type (wt) influenza-specific response (wt fluorescein \[FLU\]) after adjusting plate background response at 28 to 35 days after Dose 2
Percentage of Subjects With Antigenically Matched Strain-specific Microneutralization Seroconversion Following the Second Dose - H1N1 /ca A/New Caledonia/20/99 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H1N1 /ca A/New Caledonia/20/999 antigenically matched influenza strain
Percentage of Subjects With Antigenically Matched Strain-specific Microneutralization Seroconversion Following the Second Dose - H3N2 /wt A/Wisconsin/67/05 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H3N2 /wt A/Wisconsin/67/05 antigenically matched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - H1N1 /ca A/New Caledonia/20/99 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /ca A/New Caledonia/20/99 antigenically matched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - H3N2 /wt A/Wisconsin/67/05 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H3N2 /wt A/Wisconsin/67/05 antigenically matched influenza strain
Median Fold-Rises in the Number of Interferon-gamma Elispots Per 200,000 Peripheral Blood Mononuclear Cells (PBMCs) by T-cell Elispot Assay Following the First Dose	Post Dose 1 (28 to 42 days post Dose 1)	Median number of PBMCs secreting interferon-gamma as measured by the number of spot forming cells per 200,000 PBMCs (SPC/2 x 10\^5 PBMCs) as measured by the T-cell Elispot assay at 28 to 42 days after Dose 1. The results were summarized for wild-type (wt) influenza-specific response (wt fluorescein \[FLU\]) after adjusting plate background response at 28 to 42 days after Dose 1
Distribution of Interferon (IFN)-Alpha/Beta Gene Signature Scores Among All Subjects	Post Dose 1 (28 to 42 days post Dose 1)	Distribution of IFN-alpha/beta gene signature scores at 7 to 10 days after Dose 1. IFN alpha/beta gene signature scores were calculated as the average fold change in a panel of 21 type 1 IFN-inducible genes. The distribution of IFN alpha/beta gene signature scores ranged from -4 to 4, with -4 representing the lowest level of activity and 4 representing the highest level of activity. The percentage of subjects by IFN-alpha/beta gene signature score for each treatment group were compared.
Percentage of Subjects With Antigenically Mismatched Strain-specific Microneutralization Seroconversion Following the First Dose - H1N1 /wt A/Solomon Island/3/06 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The percentage of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /wt A/Solomon Island/3/06 antigenically mismatched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - H3N2 /wt A/Wisconsin/67/05 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H3N2 /wt A/Wisconsin/67/05 antigenically matched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the First Dose - H1N1 /wt A/Solomon Island/3/06 Influenza Strain	Post Dose 1 (28 to 42 days post Dose 1)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 1 (28-42 days after Dose 1) for the H1N1 /wt A/Solomon Island/3/06 antigenically mismatched influenza strain
Microneutralization Geometric Mean Titers (GMTs) in Baseline Seronegative Subjects Following the Second Dose - H3N2 /wt A/Brisbane/10/2007 Influenza Strain	Post Dose 2 (28 to 35 days post Dose 2)	The microneutralization GMTs of baseline seronegative subjects (baseline titer of 10 or less) achieving a 4 or more fold increase in titer from baseline at Post Dose 2 (28-35 days after Dose 2) for the H3N2 /wt A/Brisbane/10/2007 antigenically mismatched influenza strain

Secondary Outcome Measures

Name	Time	Method

Trial Locations

Locations (19): Harvey Pediatrics
🇺🇸
Jonesboro, Arkansas, United States
Healthcare Discoveries, Inc.
🇺🇸
San Antonio, Texas, United States
Palm Beach Research Center
🇺🇸
West Palm Beach, Florida, United States
Peak Medical Research, LLC
🇺🇸
Owensboro, Kentucky, United States
Celia Reyes-Acuna, M.D.
🇺🇸
Corpus Christi, Texas, United States
Allergy Immunology Research Center of North Texas
🇺🇸
Dallas, Texas, United States
Bear Care Pediatrics
🇺🇸
Ogden, Utah, United States
Pediatrics at the Beach
🇺🇸
Virginia Beach, Virginia, United States
Meridian Clinical Research, LLC
🇺🇸
Omaha, Nebraska, United States
NuLife Clinical Research
🇺🇸
Anaheim, California, United States
Arkansas Pediatric Clinic
🇺🇸
Little Rock, Arkansas, United States
Central Kentucky Research Associates
🇺🇸
Lexington, Kentucky, United States
Benchmark Research
🇺🇸
Metairie, Louisiana, United States
Henderson Pediatrics
🇺🇸
Henderson, Nevada, United States
Northeast Cincinnati Pediatric Asso., Inc.
🇺🇸
Mason, Ohio, United States
Regional Clinical Research, Inc.
🇺🇸
Endwell, New York, United States
Dayton Clinical Research
🇺🇸
Dayton, Ohio, United States
Wee Care Pediatrics
🇺🇸
Layton, Utah, United States
Advanced Pediatrics
🇺🇸
Vienna, Virginia, United States