View clinical trials related to Myxovirus Infection.
Filter by:Vaccination against influenza is a high priority for the elderly population who present the highest morbidity and mortality rate. However, due to their weak antibody response an improvement of the immune response to influenza vaccination remains an unmet medical need. The purpose of an investigational influenza vaccine candidate administered by an alternate route is to improve immune responses to the vaccine in the elderly population, which could provide additional reductions in influenza-associated morbidity and mortality in this population. Primary Objective: To demonstrate that the investigational vaccine induces a better immunogenicity than the reference vaccine in terms of seroprotection rate after the first vaccination. Secondary Objectives: Immunogenicity: To describe the antibody persistence induced by both vaccines at 3, 6, and 12 months after the first vaccination in a subset of subjects. To describe the immunogenicity of the investigational vaccine after each vaccination using parameters defined in the European Medicines Agency (EMEA) Note for Guidance (CPMP/BWP/214/96) specific to elderly subjects. Safety: To demonstrate the tolerance of the investigational vaccine after the first vaccination, in terms of pre-defined solicited systemic reactions. To describe the safety profile after each vaccination. To describe the effect of repetitive injections on the safety profile.
All marketed influenza vaccines are injected by the intramuscular route. This study will test whether an influenza vaccine is effective when injected by other route than into the muscle. In order to prove this, the amount of antibodies in the blood will be measured before and after vaccination. In addition, the safety of both influenza vaccines will be tested by evaluating all serious reactions occurring after vaccination. The vaccine injected in this study is similar to the sponsor's marketed intramuscular influenza vaccine (Vaxigrip). Primary Objective: To demonstrate and compare the immune response of two dosages of influenza vaccine administered by an alternate route to the intramuscular administration of the vaccine. Secondary Objectives: - To compare the immune response 21 days after vaccination between each investigational group versus intramuscular group for each influenza strain. - To describe the safety profile after the vaccination in each study group - To describe the compliance of the two dosages of the vaccine administered by the alternate route with the European Medicine Agency. Observational Objectives: - To describe the safety profile during the 21-day period following an intramuscular revaccination in each group and the possibility of any reaction at the first injection site. - To describe the pain at the injection site with a Visual Analog Scale and the acceptability of the injection using a questionnaire in each group. - To describe the leakage appearing at the injection site immediately after the alternate route injection and to explore the relationship with immunogenicity. - To evaluate the cellular mediated immune response in a subset of subjects.