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Phase 2 N=275 Randomized Double-blind Prevention

Reverse Genetic H9N2 Influenza Vaccine Study in Adults

Influenza

Enrolled (actual)
275
Serious AEs
0.0%
Results posted
Feb 2023
Primary outcome: Primary: Number of Subjects With a Hemagglutination Inhibition (HI) Antibody Response to the Vaccine Strain (A/H9N2/Chicken/Hong Kong/G9/97) Associated With Seroconversion 21 Days After the Second Vaccination — 27; 27; 38; 41 Participants

Study Design & Population

Study type
Interventional
Phase
Phase 2
Interventions
Reverse Genetic (RG) reassortant A/H9N2 influenza vaccine (Biological)
Age
Adult · 18+ yrs
Sex
All
Sponsor
Alachua Government Services, Inc.
Primary completion
Jun 2011

Outcome Measures

OutcomeResultp-value
PRIMARY
Number of Subjects With a Hemagglutination Inhibition (HI) Antibody Response to the Vaccine Strain (A/H9N2/Chicken/Hong Kong/G9/97) Associated With Seroconversion 21 Days After the Second Vaccination
27; 27; 38; 41; 48
PRIMARY
Number of Subjects Achieving an HI Antibody Titer >= 1:40 21 Days After the Second Vaccination
28; 28; 39; 42; 48
PRIMARY
Number of Subjects With Injection Site and Systemic Reactions Within 7 Days After the First and Second Vaccination (Vacc) by Severity
9; 10; 16; 17; 20; 0
SECONDARY
Number of Subjects Achieving an HI Antibody Titer >= 1:40 21 Days After the First Vaccination
17; 22; 33; 35; 40
SECONDARY
Number of Subjects With Antibody Response Associated With Protection 21 Days After the First and Second Vaccination Defined as Microneutralization (MN) Titer >= 1:20
45; 48; 49; 55; 54; 51
SECONDARY
Number of Subjects With Antibody Response Associated With Protection 21 Days After the First and Second Vaccination Defined as Single Radial Hemolysis (SRH) Area >= 25 mm2
45; 48; 49; 53; 53; 49
SECONDARY
Number of Participants With Antibody Response 21 Days After the First and Second Vaccination Measured by HI, MN and SRH Assays
16; 21; 32; 35; 40; 40
SECONDARY
Fold Increase of Antibody Response 21 Days After the First and Second Vaccination as Compared to Baseline Measured by HI, MN and SRH Assays
3.2; 4.5; 7.8; 10.4; 15.5; 5.7
SECONDARY
Number of Subjects With Seroconversion (as Defined for the Primary Immunogenicity Endpoint) Measured by HI Assay 21 Days After the First Vaccination as Compared to Baseline
16; 21; 32; 35; 40
SECONDARY
Number of Subjects With Seroconversion Defined as a Minimum Fourfold Increase in Titer Measured by MN Assay 21 Days After the First and Second Vaccination as Compared to Baseline
40; 44; 47; 52; 53; 49
SECONDARY
Number of Subjects With Seroconversion as Measured by SRH Assay 21 Days After the First and Second Vaccination
30; 39; 35; 42; 42; 35
SECONDARY
Number of Subjects With Antibody Response Associated With Protection 180 Days After the First Vaccination as Measured by HI, MN and SRH Assays
10; 17; 22; 28; 31; 38
SECONDARY
Number of Subjects With Antibody Response 180 Days After the First Vaccination Measured by HI, MN and SRH Assays
9; 17; 21; 28; 31; 34
SECONDARY
Fold Increase of Antibody Response 180 Days After the First Vaccination as Compared to Baseline Measured by HI, MN and SRH Assays
2.7; 3.9; 4.3; 6.1; 8.1; 5.4
SECONDARY
Number of Subjects With Fever, Malaise and Shivering With Onset Within 7 Days After the First and Second Vaccination
0; 0; 0; 0; 0; 1
SECONDARY
Frequency and Severity of Adverse Events (AEs) Observed During the Entire Study Period
25; 54; 67; 46; 64; 2

Summary

The purpose of the study is to identify the optimal dose level of a reverse genetic (RG) reassortant H9N2 pandemic influenza vaccine for further product development.

Eligibility Criteria

Inclusion Criteria

  • Subject is 18 to 49 years of age, inclusive, on the day of screening
  • Subject has an understanding of the study and its procedures, agrees to its provisions, and gives written informed consent prior to study entry
  • Subject is generally healthy, as determined by the investigator's clinical judgement through collection of medical history and performance of a physical examination
  • Subject is physically and mentally capable of participating in the study as determined by the investigator
  • Subject agrees to keep a daily record of symptoms for the duration of the study
  • If female of childbearing potential, subject presents with a negative urine pregnancy test within 24 hours prior to first vaccination and agrees to employ adequate birth control measures for the duration of the study. For the purposes of this study at least one of the following types of US Food and Drug Administration (FDA) approved birth control measures shall be applied through completion of the Day 181 study visit:
  • Hormonal types of birth control (such as implants or birth control pills) or an intrauterine device
  • A barrier type of birth control measure (i.e. condoms, diaphragms, cervical caps, etc.)

Exclusion Criteria

  • Subject has a history of exposure to H9N2 influenza virus or a history of vaccination with an H9N2 influenza vaccine
  • Subject is at potential occupational risk of contracting H9N2 influenza infection (e.g. poultry workers)
  • Subject currently suffers from or has a history of a significant (requiring hospitalization or change in intervention in past 6 months)neurological, cardiovascular, pulmonary (including asthma), hepatic, rheumatic, autoimmune, hematological, metabolic or renal disorder such as but not limited to: multiple sclerosis, lupus, Guillain-Barre syndrome as determined by the investigator
  • Subject has a body temperature of >= 100.4 degrees Fahrenheit (>= 38.0 degrees Celsius) on the day of vaccination, by oral measurement. [NOTE: Subjects meeting this exclusion criterion may be rescheduled for vaccination and study entry at a later date provided: 1) body temperature measured orally has decreased to = 35
  • Subject has hypertension at screening that is graded as greater than Stage 1 (defined as a systolic pressure > 159 or diastolic pressure > 99 while seated and at rest (measurement shall be repeated twice before subject is excluded)
  • Subject has clinically significant abnormal laboratory values at screening as determined by the investigator
  • Subject tests positive for Human Immunodeficiency Virus (HIV), Hepatitis B surface Antigen (HBsAgs) or Hepatitis C Virus (HCV)
  • Subject has any medically diagnosed or suspected immune deficient condition based on medical history and physical examination as determined by the investigator
  • Subject has an immune compromising condition or disease, or is currently undergoing a form of treatment or was undergoing a form of treatment within 30 days prior to study entry that can be expected to influence immune response. Such treatment includes, but is not limited to, systemic or high dose inhaled (> 800 μg/day of beclomethasone dipropionate or equivalent) corticosteroids, radiation treatment or other immunosuppressive or cytotoxic drugs (use of inhaled and nasal steroids will be permitted)
  • Subject has a history of severe (required immediate medical life threatening treatment and/or hospitalization) allergic reactions or anaphylaxis as determined by the investigator
  • Subject has a rash, dermatologic condition or tattoos which may interfere with injection site reaction rating as determined by the investigator
  • Subject has received any blood products (e.g. blood transfusion or immunoglobulins) within 90 days prior to study entry
  • Subject has donated one or more units of blood (approximately 450 mL) or plasma within 30 days prior to study entry
  • Subject has received any live vaccine within 4 weeks or an inactivated vaccine or a subunit vaccine within 2 weeks prior
View full record on ClinicalTrials.gov →

Data sourced from ClinicalTrials.gov (NCT01320696). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication.

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