Immunogenicity and Safety of the Concomitant Administration of OVX836 Influenza Vaccine, Quadrivalent Inactivated Influenza Vaccines and Placebo in Healthy Subjects.

The present study OVX836-006 aims principally to: * Confirm feasibility of the concomitant administration of the vaccines under normal clinical conditions, i.e. as two separate concomitant injections into opposite arms; * Introduce an additional representative brand of Quadrivalent Inactivated Influenza Vaccines ; * Demonstrate the absence of interaction between OVX836 and Quadrivalent Inactivated Influenza Vaccines on the Hemagglutinin response; * Demonstrate the absence of interaction between OVX836 and Quadrivalent Inactivated Influenza Vaccines on the nucleoprotein response; * Evaluate the absolute vaccine efficacy of OVX836 compared to placebo in order to corroborate the efficacy signals previously detected in the OVX836 previous studies; * Evaluate the combined vaccine efficacy of OVX836 + Quadrivalent Inactivated Influenza Vaccines versus OVX836 + placebo, and versus double placebo.