Study of Recombinant Influenza Vaccine Containing Different H3 Antigens Without or With Adjuvant in Healthy Adult Subjects

Completed · Phase 1

Conditions studied: Influenza Immunisation, Healthy Volunteers

In brief

The primary objectives of the study are: * To describe the safety profile of the different formulations in all participants * To describe the hemagglutinin inhibition (HAI) and seroneutralization (SN) antibody responses against hemagglutinin (H1, H3, B/Victoria, and B/Yamagata) antigens present in the control vaccine in all groups at all timepoints. The secondary objectives are: * To describe antigenic coverage in each group by assessing the HAI and SN antibody responses against a panel of H3 antigens (not present in any of the vaccine formulations). * To describe SN antibody responses in each group against each of the H3 antigens. * To compare H3 HAI and SN antibody responses for the groups with quadrivalent recombinant influenza vaccine (RIV) formulations with H3 antigens to those of the quadrivalent RIV control group. * To compare the HAI and SN antibody responses for the groups with quadrivalent RIV formulation with adjuvant to the group without adjuvant.

Key facts

Study ID: NCT04451954
Run by: Sanofi Pasteur, a Sanofi Company
People needed: 210
Starts: 2020-07-02
Expected to finish: 2021-09-20
Last updated by the study team: 2025-09-17

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: accepted.

You may qualify if…

Older adults: Aged 50 years and older on the day of inclusion Young adults: Aged 18 to 30 years on the day of inclusion
Informed consent form has been signed and dated
Able to attend all scheduled visits and to comply with all trial procedures

You may not qualify if…

Participant is pregnant, or lactating, or of childbearing potential and not using an effective method of contraception or abstinence from at least 4 weeks prior to vaccination until at least 12 weeks postvaccination. To be considered of non-childbearing potential, a female must be premenarche, or postmenopausal for at least 1 year, or surgically sterile
Participation at the time of study enrollment (or in the 4 weeks preceding the study vaccination) or planned participation during the present study period in another clinical study investigating a vaccine, drug, medical device, or medical procedure
Receipt of any vaccine in the 4 weeks preceding the study vaccination or planned receipt of any vaccine in the 4 weeks following study vaccination
Previous vaccination against influenza during either of the previous 2 influenza seasons (2018-2019 and 2019-2020) with any licensed or investigational influenza vaccine
Receipt of immune globulins, blood, or blood-derived products in the past 3 months
Known or suspected congenital or acquired immunodeficiency; immunosuppressive therapy (such as anticancer chemotherapy or radiation therapy, within the preceding 6 months); or long-term systemic corticosteroid therapy (prednisone or equivalent for more than 2 consecutive weeks within the past 3 months) or receipt of hydroxychloroquine within the preceding 4 weeks
Dementia or any other cognitive condition at a stage that could interfere with following the trial procedures
Have known active or recently active (12 months) neoplastic disease or a history of any hematologic malignancy
History of influenza infection during either of the previous 2 influenza seasons (2018- 2019 or 2019-2020), confirmed by laboratory tests (including rapid tests) at that time
History of laboratory confirmed coronavirus disease 2019 (COVID-19), confirmed with a nucleic acid amplification test on a respiratory specimen, or known exposure to severe acute respiratory syndrome coronavirus (SARS-CoV-2) positive confirmed close contact (eg, family member, housemate, daycare provider, aged parent requiring care), in the 30 days preceding vaccination, at the discretion of the investigator
Self-reported or documented seropositivity for human immunodeficiency virus, hepatitis B, or hepatitis C
Known systemic hypersensitivity to any of the vaccine components, or history of a life-threatening reaction to the vaccines used in the study or to a vaccine containing any of the same substances
Have any diagnosis, current or past, of an autoimmune disease
Thrombocytopenia or bleeding disorder, contraindicating intramuscular vaccination based on investigator's judgment
Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily
Any change in chronic prescription medication or change in medication dose or dosage in the 60 days prior to enrollment
Alcohol abuse or substance abuse that, in the opinion of the investigator, might interfere with the study conduct or completion
Chronic illness that, in the opinion of the investigator, is at a stage where it might interfere with study conduct or completion
Any current or past diagnosis of chronic pulmonary disease including asthma (history of childhood asthma is allowed), cystic fibrosis and chronic pulmonary obstructive disease
Have taken a high-dose inhaled corticosteroid within 6 months prior to study vaccination
Body mass index of 40 or higher
Any current or past diagnosis of cardiac disease (eg, coronary artery disease, heart failure, or valvular heart disease [mild mitral valve prolapse allowed]). Participants with isolated primary (essential) hypertension are allowed
Moderate or severe acute illness/infection (according to investigator judgment) on the day of vaccination or febrile illness (oral temperature ≥100.4 F [≥38.0 C]). A prospective participant should not be included in the study until the condition has resolved or the febrile event has subsided
Identified as an investigator or employee of the investigator or study center with direct involvement in the proposed study, or identified as an immediate family member (ie, parent, spouse, natural or adopted child) of the investigator or employee with direct involvement in the proposed study
Personal or family history of Guillain-Barré syndrome

Where it is running

Investigational Site Number 8400003 — San Diego, California, United States
Investigational Site Number 8400002 — Melbourne, Florida, United States
Investigational Site Number 8400004 — Orlando, Florida, United States
Investigational Site Number 8400001 — Peoria, Illinois, United States
Investigational Site Number 8400005 — Rockville, Maryland, United States

Full record on ClinicalTrials.gov

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