Vaccine protection depends on a specific adaptive immune memory. However, a little-explored aspect of certain live vaccines may provide beneficial, non-specific protection against infections or pathogens other than the one from which the vaccine is derived. This is the concept of innate immune memory or trained immunity, which differs from adaptive memory in its non-specificity. Innate immune memory is triggered by exposure to immunostimulants, and offers protection against unrelated pathogenic threats for several months or even years. The project aims to carry out an exploratory study to observe, in the context of current practice, the immune response obtained after a subunit and a live attenuated vaccine