Using the seasonal Influenza vaccine as an example of conventional vaccine, this study will evaluate and compare the efficacy ofTC, ID and IMroutes of immunization to induce cellular responses at day 21 and memory responses at month 5 phases. The generation and maintenance of Flu specific and neutralizing antibodies will be measured by Haemagglutination Inhibition and microneutralization assays.Moreover, safety and tolerance to each vaccination methods will be evaluated as well as inflammation and innate immune response induced at day 1 after vaccination.