Influenza virus infections are current in viral infections of childhood. The quick test is now available and we want to assess its clinical and economical benefit through an unicentric study and during two seasons of influenza pandemic. An hospitalization avoided due to a quick test is equivalent to 20 to 30 general practitioner fixes fees. For social security, it is equivalent to 55 to 83 quick tests per child per hospitalization avoid. We plead for free test during influenza pandemic.