Originally known as serum hepatitis, Hepatitis B has only been recognized as such since World War II, and has caused current epidemics in parts of Asia and Africa. Hepatitis B is recognized as endemic in China and various other parts of Asia. Over one-third of the world's population has been or is actively infected by hepatitis B virus (acronym HBV).

Hepatitis A is a disease affecting the liver, and caused by the Hepatitis A virus (abbreviated HAV). Only 3 out of 4 people with hepatitis A have symptoms. Those symptoms may include:* Jaundice (showing up first as yellow eyes)* Dark urine* Nausea* Fever* Tiredness* Loss of appetite* Stomach ache* Vomiting

Hepatitis B as related to Hepatitis A