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Phase 2 N=304 Randomized Double-blind Prevention

2017 A/H7N9 IIV Revaccination

Avian Influenza · Influenza Immunisation

Enrolled (actual)
304
Serious AEs
0.7%
Results posted
Jul 2021
Primary outcome: Primary: Geometric Mean Titers (GMT) of Serum Hemagglutination Inhibition (HAI) Antibodies on Day 22 Against the 2017 Influenza A/H7N9 Vaccine Virus — 22.7; 116.1; 77.7; 190.3 titer

Study Design & Population

Study type
Interventional
Phase
Phase 2
Interventions
A/H7N9 (Biological); AS03 (Drug); Phosphate Buffered Saline (PBS) diluent (Other)
Age
Adult, Older Adult · 19+ yrs
Sex
All
Sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
Primary completion
Jun 2020

Outcome Measures

OutcomeResultp-value
PRIMARY
Geometric Mean Titers (GMT) of Serum Hemagglutination Inhibition (HAI) Antibodies on Day 22 Against the 2017 Influenza A/H7N9 Vaccine Virus
22.7; 116.1; 77.7; 190.3; 10.9; 31.7
PRIMARY
Geometric Mean Titers (GMT) of Serum Neutralizing (Neut) Antibodies on Day 22 Against the 2017 Influenza A/H7N9 Vaccine Virus
64.3; 367.6; 204.5; 870.9; 28.6; 72.2
PRIMARY
Number of Participants Reporting Serious Adverse Events (SAEs)
0; 1; 0; 0; 0; 0
PRIMARY
Number of Participants Reporting Clinical Safety Laboratory Adverse Events (AEs)
1; 0; 3; 0; 3; 0
PRIMARY
Number of Participants Reporting Solicited Injection Site Reactogenicity Events
11; 35; 5; 16; 11; 38
PRIMARY
Number of Participants Reporting Solicited Systemic Reactogenicity Events
12; 24; 8; 6; 16; 16
PRIMARY
Percentage of Participants Achieving Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater on Day 22 Against the 2017 Influenza A/H7N9 Vaccine Virus
49; 88; 75; 89; 20; 59
PRIMARY
Percentage of Participants Achieving Neutralizing (Neut) Antibody Titer of 1:40 or Greater on Day 22 Against the 2017 Influenza A/H7N9 Vaccine Virus
69; 98; 92; 100; 43; 66
PRIMARY
Percentage of Participants Achieving Hemagglutination Inhibition (HAI) Antibody Seroconversion on Day 22 Against the 2017 Influenza A/H7N9 Study Vaccine Virus
49; 88; 75; 83; 20; 52
PRIMARY
Percentage of Participants Achieving Neutralizing (Neut) Antibody Seroconversion on Day 22 Against the 2017 Influenza A/H7N9 Study Vaccine Virus
69; 98; 83; 100; 43; 64
SECONDARY
Geometric Mean Titers (GMT) of Serum Hemagglutination Inhibition (HAI) Antibodies on Day 8 Against the 2017 Influenza A/ H7N9 Vaccine Virus
13.9; 54.2; 36.2; 113.9; 9.9; 18.1
SECONDARY
Geometric Mean Titers (GMT) of Serum Hemagglutination Inhibition (HAI) Antibodies on Day 181 Against the 2017 Influenza A/ H7N9 Vaccine Virus
10.5; 40.0; 35.1; 79.5; 9.9; 11.5
SECONDARY
Geometric Mean Titers (GMT) of Serum Neutralizing (Neut) Antibodies on Day 8 Against the 2017 Influenza A/H7N9 Vaccine Virus
34.3; 153.2; 108.9; 482.5; 17.5; 31.4
SECONDARY
Geometric Mean Titers (GMT) of Serum Neutralizing (Neut) Antibodies on Day 181 Against the 2017 Influenza A/H7N9 Vaccine Virus
24.1; 105.3; 73.4; 296.3; 14.3; 17.0
SECONDARY
Geometric Mean Titers (GMTs) of Serum Hemagglutination Inhibition (HAI) Antibodies on Day 22 Against the 2013 Influenza A/H7N9 Vaccine Virus (Priming Vaccine Virus)
18.7; 92.7; 62.6; 166.3; 9.0; 21.0
SECONDARY
Geometric Mean Titers (GMTs) of Serum Neutralizing (Neut) Antibodies on Day 22 Against the 2013 Influenza A/H7N9 Vaccine Virus (Priming Vaccine Virus)
98.5; 515.4; 329.4; 1015.9; 39.3; 102.1
SECONDARY
Number of Participants Reporting Medically-Attended Adverse Events (MAAEs), New-Onset Chronic Medical Conditions (NOCMCs), and Potentially Immune-Mediated Medical Conditions (PIMMCs)
5; 8; 5; 6; 13; 7
SECONDARY
Number of Participants Reporting Unsolicited Non-serious AEs
9; 10; 3; 4; 15; 10
SECONDARY
Percentage of Participants Achieving Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater on Day 8 Against the 2017 Influenza A/H7N9 Vaccine Virus
28; 65; 63; 83; 18; 41
SECONDARY
Percentage of Participants Achieving Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater on Day 181 Against the 2017 Influenza A/H7N9 Vaccine Virus
20; 55; 54; 78; 18; 25
SECONDARY
Percentage of Participants Achieving Neutralizing (Neut) Antibody Titer of 1:40 or Greater on Day 8 Against the 2017 Influenza A/H7N9 Vaccine Virus
53; 80; 79; 100; 33; 48
SECONDARY
Percentage of Participants Achieving Neutralizing (Neut) Antibody Titer of 1:40 or Greater on Day 181 Against the 2017 Influenza A/H7N9 Vaccine Virus
31; 75; 67; 94; 23; 32
SECONDARY
Percentage of Participants Achieving Hemagglutination Inhibition (HAI) Antibody Seroconversion on Day 8 Against the 2017 Influenza A/H7N9 Vaccine Virus
28; 60; 58; 83; 18; 34
SECONDARY
Percentage of Participants Achieving Hemagglutination Inhibition (HAI) Antibody Seroconversion on Day 181 Against the 2017 Influenza A/H7N9 Vaccine Virus
20; 53; 50; 72; 18; 18
SECONDARY
Percentage of Participants Achieving Neutralizing (Neut) Antibody Seroconversion on Day 8 Against the 2017 Influenza A/H7N9 Vaccine Virus
53; 80; 75; 100; 33; 48
SECONDARY
Percentage of Participants Achieving Neutralizing (Neut) Antibody Seroconversion on Day 181 Against the 2017 Influenza A/H7N9 Vaccine Virus
31; 73; 63; 94; 23; 32
SECONDARY
Percentage of Participants Achieving Hemagglutination Inhibition (HAI) Antibody Titer of 1:40 or Greater on Day 22 Against the 2013 Influenza A/H7N9 Vaccine Virus (Priming Vaccine Virus)
34; 85; 75; 94; 15; 45
SECONDARY
Percentage of Participants Achieving Neutralizing (Neut) Antibody Titer of 1:40 or Greater on Day 22 Against the 2013 Influenza A/H7N9 Vaccine Virus (Priming Vaccine Virus)
74; 98; 96; 100; 50; 84
SECONDARY
Percentage of Participants Achieving Hemagglutination Inhibition (HAI) Antibody Seroconversion on Day 22 Against the 2013 Influenza A/H7N9 Vaccine Virus (Priming Vaccine Virus)
34; 85; 75; 89; 15; 45
SECONDARY
Percentage of Participants Achieving Neutralizing (Neut) Antibody Seroconversion on Day 22 Against the 2013 Influenza A/H7N9 Vaccine Virus (Priming Vaccine Virus)
74; 98; 96; 100; 50; 84

Summary

This is a Phase II clinical trial in up to 420 males and non-pregnant females, 19 to 70 years of age, inclusive, who are in good health and meet all eligibility criteria. This clinical trial is designed to assess the safety, reactogenicity and immunogenicity of one dose of a monovalent inactivated split influenza 2017 A/H7N9 virus vaccine (2017 A/H7N9 IIV), administered intramuscularly (IM) at 3.75 mcg hemagglutinin (HA) per dose, given with or without AS03 adjuvant to subjects primed with a monovalent inactivated split influenza 2013 A/H7N9 virus vaccine (2013 A/H7N9 IIV) in DMID Protocols 13-0032 and 13-0033, or to those who are A/H7 IIV-naïve. Phosphate buffered saline (PBS) diluent will be used to achieve the targeted dosage. The study will be conducted at 9 Vaccine and Treatment Evaluation Unit (VTEU) sites (including their subcontractors). Study duration is approximately 17 months with subject participation duration up to 13 months. The primary objectives are: 1) to assess the safety and reactogenicity of 2017 A/H7N9 IIV given with or without AS03 adjuvant following receipt of one dose of study vaccine; 2) to assess the serum hemagglutination inhibition (HAI) and neutralizing (Neut) antibody responses following receipt of the study vaccine.

Eligibility Criteria

Inclusion Criteria

Subjects eligible to participate in this trial must meet all of the following inclusion criteria:

  • Provide written informed consent prior to initiation of any study procedures.
  • Are able to understand and comply with planned study procedures and be available for all study visits.
  • Must agree to the collection of venous blood per protocol.
  • Must agree to have residual specimens and samples/specimens collected during this trial specifically for the purpose of future research stored for future research use.
  • Are males or non-pregnant females, 19 to 70 years of age, inclusive.
  • Are in good health* *As determined by medical history and physical examination to evaluate acute or currently ongoing chronic medical diagnoses or conditions, defined as those that have been present for at least 90 days, which would affect the assessment of the safety of subjects or the immunogenicity of study vaccinations. Chronic medical diagnoses or conditions should be stable for the last 60 days (no hospitalizations, emergency room or urgent care for condition and no adverse symptoms that need medical intervention such as medication change/supplemental oxygen). This includes no change in chronic prescription medication, dose or frequency as a result of deterioration of the chronic medical diagnosis or condition in the 60 days prior to enrollment. Any prescription change that is due to change of health care provider, insurance company, etc., or that is done for financial reasons, as long as in the same class of medication, will not be considered a deviation of this inclusion criterion. Any change in prescription medication due to improvement of a disease outcome, as determined by the site PI or appropriate sub-investigator, will not be considered a deviation of this inclusion criterion. Subjects may be on chronic or as needed (prn) medications if, in the opinion of the site PI or appropriate sub-investigator, they pose no additional risk to subject safety or assessment of reactogenicity and immunogenicity and do not indicate a worsening of medical diagnosis or condition. Similarly, medication changes subsequent to enrollment and study vaccination are acceptable provided there was no deterioration in the subject's chronic medical condition that necessitated a medication change, and there is no additional risk to the subject or interference with the evaluation of responses to study vaccination. Note: Topical, nasal and inhaled medications (except inhaled corticosteroids as outlined in the Subject Exclusion Criteria as well as herbals, vitamins and supplements are permitted.
  • Oral temperature is less than 100.0 degrees Fahrenheit.
  • Pulse is 47 to 100 beats per minute, inclusive.
  • Systolic blood pressure is 85 to 150 mmHg, inclusive.
  • Diastolic blood pressure is 55 to 95 mmHg, inclusive.
  • Erythrocyte Sedimentation Rate (ESR) is less than 30 mm per hour.
  • Women of childbearing potential** must use an acceptable contraception method*** from 30 days before study vaccination until 60 days after study vaccination.

**Not sterilized via tubal ligation, bilateral oophorectomy, salpingectomy, hysterectomy, or successful Essure(R) placement (permanent, non-surgical, non-hormonal sterilization) with documented radiological confirmation test at least 90 days after the procedure, and still menstruating or <1 year has passed since the last menses if menopausal.

***Includes non-male sexual relationships, abstinence from sexual intercourse with a male partner, monogamous relationship with vasectomized partner who has been vasectomized for 180 days or more prior to the subject receiving the study vaccination, barrier methods such as condoms or diaphragms/cervical cap with spermicide, effective intrauterine devices, NuvaRing(R), and licensed hormonal methods such as implants, injectables or oral contraceptives ("the pill").

  • Women of childbearing potential must have a negative urine or serum pregnancy test within 24 hours
View full record on ClinicalTrials.gov →

Data sourced from ClinicalTrials.gov (NCT03738241). 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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