Hepatitis is an inflammation of the liver. The condition can be self-limiting or can progress to fibrosis (scarring), cirrhosis or liver cancer. Hepatitis viruses are the most common cause of hepatitis in the world but other infections, toxic substances (e.g. alcohol, certain drugs), and autoimmune diseases can also cause hepatitis.
There are five types of viral hepatitis: A, B,C, D, and E. Hepatitis A, an acute infection caused by a virus of the genus Hepatovirus is transmitted by contaminated food and water. Hepatitis B, caused by a virus of the genus Orthohepadnavirus and Hepatitis C, caused by a virus of the genus Hepacivirus, are more serious infections that are transmitted through infected bodily fluids such as blood and semen.