Safety and Immunogenicity of a Monovalent mRNA Vaccine Encoding Influenza Hemagglutinin in Adult Participants 18 Years of Age and Older

A Phase I, Parallel, Randomized, Active-controlled, Multi-center, Dose-escalation Study With Early Safety Data Reviews to Assess Safety and Immunogenicity of a Monovalent mRNA Vaccine Encoding Influenza Hemagglutinin in Adults 18 Years of Age and Older

The purpose of this study is to evaluate the safety and immunogenicity of a single intramuscular (IM) injection of different dose levels of messenger ribonucleic acid (mRNA) vaccine encoding influenza hemagglutinin compared to an active control quadrivalent recombinant influenza vaccine (RIV4) in adults 18 years of age and older. Study details include:

Study Duration: approximately 6 months Treatment Duration: 1 injection of mRNA vaccine encoding influenza hemagglutinin encoding influenza hemagglutinin or control.

Visit Frequency: Screening visit, Day 01, Day 02, Day 03, Day 09, Day 29, Day 91, Day 181

Approximately 6 months

Inclusion Criteria:

• Having given written informed consent prior to undertaking any study-related procedure. Exclusion Criteria: Participants are excluded from the study if any of the following criteria apply:
• Any subject who, in the judgment of the Investigator, is likely to be noncompliant during the study, or unable to cooperate because of a language problem or poor mental development.

The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.