The aim is to document viral etiologies of isolated fevers and inlfuenza-like syndromes during summertime in South of France in order to better understand the role of known vector-borne viruses such as Toscana virus, West Nile virus during seasonal activity of the arthropod vector. In each of the four cities, a network of general practitioners will be associated in the project to recruit patients who are not hospitalized. The combined involvement of infectious disease specialists and general practitioner will augment the range of patients (mild disease and sever cases) in the study.

Inclusion Criteria:

• Old: equal to or higher than 5 years Living in the south of France, without voyage abroad in the 2 weeks preceding inclusion Presenting a fever or a syndrome pseudogripal since less than 7 days without diagnostic orientation nor infectious pathology of body,
• Affiliated with a mode of social security
• After obtaining free and informed of the written assent

Exclusion Criteria:

• Subject whose adhesion with the protocol is improbable according to the investigator
• Expectant mother
• Subject taking part in another clinical trial or in period of exclusion of a preceding clinical trial infectious
• Pathology of body requiring a specific treatment
• Discovered after inclusion d' a pregnancy