Another viral disease is hepatitis. Hepatitis infects and enlarges the liver, causing jaundice (yellowing of the skin), nausea, fever and pain in the abdomen Hepatitis is a serious disease and lead to other health problems. People who get better may carry the disease in their blood for years and can infect others. Hepatitis is one of the few infectious disaese that is increasing, especially among adults There are two main types of hepatitis-hepatitis A and hepatitis B.