Safety and Immunogenicity of Different Formulations of an MF59-Adjuvanted Influenza Vaccine in Older Adults ≥50 Years of Age

Completed · Phase 2

Conditions studied: Influenza, Human

In brief

This Phase 2, randomized, observer-blind, dose-confirmation clinical study evaluated different formulations of MF59-Adjuvanted Quadrivalent Subunit Inactivated Influenza Vaccine. Approximately 1000 subjects were randomized into 1 of 4 possible treatment groups with approximately 250 participants per group. Every participant received an influenza vaccine injection on Day 1 and were to be followed up for approximately 6 months following injection. The primary immunogenicity analysis is based on Day 29 serology data.

Key facts

Study ID

NCT05501561

Run by

Seqirus

People needed

1056

Starts

2022-08-25

Expected to finish

2023-03-31

Last updated by the study team

2026-06-30

Who can join

Age: 50 and older. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• In order to participate in this study, all subjects must meet ALL of the inclusion criteria described.
• Individuals ≥50 years of age on the day of informed consent.
• Individuals who have voluntarily given written consent after the nature of the study has been explained according to local regulatory requirements, prior to study entry.
• Individuals who can comply with study procedures including follow-up .
• Males, females of non-childbearing potential or females of childbearing potential who are using an effective birth control method, at least 30 days prior to informed consent, which they intend to use for at least 2 months after the study vaccination.

You may not qualify if…

• In order to participate in this study, all subjects must not meet ANY of the exclusion criteria described below:
• Females of childbearing potential who are pregnant, lactating, or who have not adhered to a specified set of contraceptive methods from at least 30 days prior to informed consent and who do not plan to do so for at least 2 months after the study vaccination.
• Progressive, unstable or uncontrolled clinical conditions.
• Hypersensitivity, including allergy, to any component of vaccines whose use is foreseen in this study.
• History of any medical condition considered an adverse event of special interest (AESI).
• Known history of Guillain-Barré syndrome or another demyelinating disease such as encephalomyelitis and transverse myelitis.
• Clinical conditions representing a contraindication to intramuscular administration of vaccines or blood draw.
• Abnormal function of the immune system resulting from:
• Clinical conditions.
• Systemic administration of corticosteroids (PO/IV/IM) at a dose of ≥20 mg/day of prednisone or equivalent for more than 14 consecutive days within 90 days prior to informed consent5.
• Administration of antineoplastic and immunomodulating agents or radiotherapy within 90 days prior to informed consent.
• Receipt of immunoglobulins or any blood products within 180 days prior to informed consent.
• Receipt of an investigational or non-registered medicinal product within 30 days prior to informed consent.
• Receipt of any COVID-19 vaccine within 14 days (non-replicating vaccines) or 28 days (replicating vaccines) prior to informed consent or plan to receive any COVID-19 vaccine within 7 days from study vaccination
• Individuals who received any other vaccines within 14 days (for inactivated vaccines) or 28 days (for live vaccines) prior to informed consent or who are planning to receive any vaccine within 28 days from the study vaccines.
• Study personnel or immediate family or household member of study personnel.
• Receipt of any influenza vaccine within 6 months prior to informed consent, or plan to receive an influenza vaccine during the study period.
• Acute (severe) febrile illness,
• Any other clinical condition that, in the opinion of the investigator, might interfere with the results of the study or pose additional risk to the subject due to participation in the study.

Where it is running

• AMR Tempe — Tempe, Arizona, United States
• Marvel Clinical Research — Huntington Beach, California, United States
• California Research Center — San Diego, California, United States
• The Lynn Institute of The Rockies — Colorado Springs, Colorado, United States
• Clinical Research Consulting, LLC — Milford, Connecticut, United States
• Innovative Research of West Florida, Inc. — Clearwater, Florida, United States
• Velocity Clinical Research - New Smyrna Beach — Edgewater, Florida, United States
• CenExel RCA — Hollywood, Florida, United States
• Health Awareness INC — Jupiter, Florida, United States
• Global Health Research Center — Miami Lakes, Florida, United States
• Precision Clinical Research — Sunrise, Florida, United States
• Global Health Research Center — Tampa, Florida, United States
• Platinum Research Network, LLC — Savannah, Georgia, United States
• Meridian Clinical Research - Savannah — Savannah, Georgia, United States
• AMR El Dorado — El Dorado, Kansas, United States
• AMR Lexington — Lexington, Kentucky, United States
• Meridian Clinical Research — Baton Rouge, Louisiana, United States
• Medpharmics, LLC — Metairie, Louisiana, United States
• Rockville Internal Medicine Group — Rockville, Maryland, United States
• MedPharmics LLC — Biloxi, Mississippi, United States
• Healthcare Research Network — Hazelwood, Missouri, United States
• The Center for Pharmaceutical Research — Kansas City, Missouri, United States
• Sundance Clinical Research, LLC — St Louis, Missouri, United States
• Meridian Clinical Research — Bellevue, Nebraska, United States
• Meridian Clinical Research — Grand Island, Nebraska, United States

Full record on ClinicalTrials.gov

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