<prompt> Acute Viral hepatitis A E are diagnosed byIgM A IgM EIgG A IgG ELiver biosyVirus in stool  <response>: A IgM A IgM E CLINICAL AND EPIDEMIOLOGIC FEATURES OF VIRAL HEPATITISFeatureHAVHBVHCVHDVHEV Incubation days15-45, mean 3030-180, mean 60-9015-160, mean 5030-180, mean 60-9014-60, mean 40 OnsetAcuteInsidious or acuteInsidiousInsidious or acuteAcute Age preferenceChildren, young adultsYoung adults sexual and percutaneous, babies, toddlersAny age, but more common in adultsAny age similar to HBVYoung adults 20-10 yearsTransmission Fecal-oral --- PercutaneousUnusual - Perinatal- - Sexual -Clinical SeverityMildOccasionally severeModerateOccasionally severeMild Fulminant0.10.1-10.15-201-2 