A Study to Evaluate Safety, Immunogenicity, and Lot-to-Lot Consistency of H5N1 Subunit Influenza Virus Vaccine in Healthy Adult Subjects ≥18 Years of Age

Seqirus3,196 enrolled

Overview

This Phase 3 study evaluates the safety, immunogenicity and lot-to lot consistency of 3 lots of aH5N1c vaccine for pandemic avian influenza, in approximately 2394 healthy adults ≥18 years of age receiving the vaccine and 797 healthy adults receiving placebo. Subjects were randomized in a 3:1 ratio to receive either aH5N1c vaccine or saline placebo. Enrollment was stratified by age: 18 to \<65 years of age and ≥65 years of age, to allow adequate safety assessment of the entire age spectrum.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

PREVENTION

Masking

DOUBLE

Enrollment

3,196

Conditions

Avian Influenza

Interventions

aH5N1cBIOLOGICAL

Eligibility

Sex: ALLMin age: 18 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Subjects ≥ 18 years of age, mentally competent, in good health as determined by medical history, physical examination and clinical judgment by the Investigator; able to comply with all study procedures, to be contacted, and to be available for study visits according to the protocol. Exclusion Criteria: * Individuals who are pregnant or breastfeeding. Female subjects of childbearing potential must have a negative pregnancy test prior to study vaccines being administered. * Females of childbearing potential who refuse to use an acceptable method of birth control from Day 1 (1st vaccination) to 3 weeks after the second study vaccination, and, if sexually active, who have not used a reliable birth control method for at least two months prior to study entry. * Individuals with a body temperature ≥38.0 °C (≥100.4 °F) or any acute illness within 3 days of intended study vaccination. * Individuals who received any type of influenza vaccine (e.g., "seasonal") within 7 days prior to enrolment in this study or who are planning to receive any type of influenza vaccine within 7 days (before or after) from the study vaccines. * Individuals who received any other licensed vaccines within 14 days (for inactivated vaccines) or 28 days (for live vaccines) prior to enrollment in this study or who are planning to receive any (non-influenza) vaccine within 28 days (before or after) from the study vaccines. * Individuals with known or suspected impairment of the immune system.

Locations (26)

Optimal Research, LLC

Huntsville, Alabama, United States

Radiant Research

Chandler, Arizona, United States

Clinical Research Consortium Arizona

Tempe, Arizona, United States

Optimal Research Site

San Diego, California, United States

California Research Foundation

San Diego, California, United States

Clinical Research Consulting, LLC

Milford, Connecticut, United States

Innovative Research of West Florida, Inc.

Clearwater, Florida, United States

Optimal Research, LLC

Melbourne, Florida, United States

Great Lakes Clinical Trials LLC

Chicago, Illinois, United States

Optimal Research

Peoria, Illinois, United States

...and 16 more locations

Outcomes

Primary Outcomes

Primary Immunogenicity Endpoint: Geometric Mean Titer (GMT) at Day 43 by Lot

Hemagglutination Inhibition (HI) GMT was assessed at Day 1 and Day 43 for 3 consecutively produced lots.

Time frame: Day 1, Day 43

Primary Immunogenicity Endpoint: Percentage of Subjects With Haemagglutination Inhibition (HI) Titer ≥ 1:40 at Day 43 by Age Cohort

Percentage of subjects with HI titer ≥ 1:40 at Day 43 was assessed by age cohort (18 to \<65 years of age and ≥65 years of age) for the pooled lots. Center for Biologics Evaluation and Research (CBER) criterion for subjects aged 18 to \<65 years: The lower bound of the 2-sided 95% CI for the percentage of subjects achieving an HI antibody titer ≥1:40 should meet or exceed 70%. CBER criterion for subjects aged ≥65 years: The lower bound of the 2-sided 95% CI for the percentage of subjects achieving an HI antibody titer ≥1:40 should meet or exceed 60%.

Time frame: Day 1, Day 43

Percentage of Subjects With Solicited Local, Solicited Systemic, and Other Adverse Events (AEs) as Measured for 7 Days (Inclusive) Following Each Vaccination

Percentages of subjects with solicited local, solicited systemic, and other AEs as measured for 7 days (inclusive) following each vaccination (first and second) and any (first or second) vaccination, by treatment group and calculated for several time intervals after vaccination : 30 minutes, 1 to 3 days (without 30 minutes), 4 to 7 days, and 1 to 7 days (without 30 minutes), and 1 to 3 days (including 30 minutes) and 1 to 7 days (including 30 minutes). Analysis for intervals of the first 30 minutes, days 1 to 3, and days 4 to 7 was not performed.

Time frame: Day 1 to Day 7

Percentages of Subjects With Any Unsolicited AEs Reported Through 21 Day After Vaccination

Percentages of subjects with any unsolicited AEs reported through 21 days after each (first and second) and any (first or second) vaccination by treatment group.

Time frame: Day 1 to Day 43

Percentages of Subjects Reporting SAEs, AESIs, NOCD, AEs Leading to Vaccine/Study Withdrawal, and Medically Attended AEs, and Concomitant Medications Associated With These Events as Collected From Day 1 to Day 387, by Vaccine Group.

Percentages of subjects with any adverse events (AE), adverse events of special interest (AESI), new onset of chronic disease (NOCD), and serious adverse event (SAE) through study termination by treatment group.

Time frame: Day 1 to Day 387

Secondary Outcomes

Secondary Immunogenicity Endpoint: Geometric Mean Titer (GMT) at Day 1, Day 22, Day 43, and Day 183 by Vaccine Group (aH5N1c or Placebo) and by Age Cohort (18 to <65 Years of Age and ≥65 Years of Age).

Estimates of hemagglutination inhibition (HI) GMTs, and their associated 95% CIs at Day 1, Day 22, Day 43 and Day 183 were computed using ANCOVA with factors for treatment (active treatment groups or placebo), center and a covariate for the effect defined by the log-transformed prevaccination antibody titer (Day 1).

Time frame: Day 1, Day 22, Day 43, and Day 183

Secondary Immunogenicity Endpoint: Percentage of Subjects With Haemagglutination Inhibition (HI) Titer ≥ 1:40 on Day 1, Day 22, Day 43 and Day 183 by Vaccine Group (aH5N1c or Placebo) and by Age Cohort (18 to <65 Years of Age and ≥65 Years of Age).

The percentage of subjects with HI titer ≥1:40 data over time by vaccine group and age cohort are presented. CBER criterion for subjects aged 18 to \<65 years: The lower bound of the 2-sided 95% CI for the percentage of subjects achieving an HI antibody titer ≥1:40 should meet or exceed 70%. CBER criterion for subjects aged ≥65 years: The lower bound of the 2-sided 95% CI for the percentage of subjects achieving an HI antibody titer ≥1:40 should meet or exceed 60%.

Time frame: Day 1, Day 22, Day 43 and Day 183

Secondary Immunogenicity Endpoint: Percentage of Subjects Achieving Seroconversion on Day 22, and Day 43 by Vaccine Group (aH5N1c or Placebo) and by Age Cohort (18 to <65 Years of Age and ≥65 Years of Age).

Percentage of subjects achieving seroconversion (defined as: HI titer ≥1:40 for subjects negative at baseline \[HI titer \<1:10\]; or a minimum 4-fold increase in HI titer for subjects positive at baseline \[HI titer ≥1:10\]) on Day 22, and Day 43 by vaccine group (aH5N1c or placebo) and by age cohort (18 to \<65 years of age and ≥65 years of age).

Time frame: Day 22, and Day 43

Secondary Immunogenicity Endpoint: Geometric Mean Titer (GMT) at Day 1, Day 22, Day 43 and Day 183 by Vaccine Group (aH5N1c or Placebo) and By Age Cohort (18 to <60 Years of Age and ≥60 Years of Age)

Hemagglutination inhibition (HI) GMTs were assessed over time for the vaccine group and age cohort. Adjusted estimates of GMTs, and their associated 95% CIs at Day 1, Day 22, Day 43 and Day 183 were computed using ANCOVA with factors for treatment (active treatment groups or placebo), center and a covariate for the effect defined by the log-transformed prevaccination antibody titer (Day 1).