HAV - Hepatitis A Virus (order Picornavirales, family Picornaviridae), cause of the disease Hepatitis A. Many cases have few or no symptoms, especially in the young. The time between infection and symptoms, in those who develop them, is between two and six weeks. When symptoms occur, they typically last eight weeks and may include nausea, vomiting, diarrhea, jaundice, fever, and abdominal pain. Around 10-15% of people experience a recurrence of symptoms during the six months after the initial infection. Acute liver failure may rarely occur, with this being more common in the elderly. Image colorization of a Transmission Electron Micrograph view (TEM). Viral diameter approximately 30 nm.