Direct constitution of collection from various samples taken on a prospective cohort of healthy volunteers, to prepare human biological samples of known characteristics (biochemical and serological in particular) and quality controlled.~This collection will allow, as a priority, a development stage, ie the establishment of the proof of concept of new diagnostic methods in the field of infectious and tropical diseases.~There will be 2 cohorts (= arms) for this study: the main cohort of healthy volunteers and the N cohort, which will consist of patients with neuro-meningeal disease of infectious appearance and followed in specialized consultation.
Direct constitution of collections from various samples taken on a prospective cohort of healthy volunteers, to prepare human biological samples of known characteristics (biochemical and serological in particular) and quality controlled.