Hepatitis is a serious and potentially life-threatening virus that affects the liver. It can be caused by a variety of viruses, including hepatitis A, B, C, D and E. Treatment for hepatitis depends on the type of virus causing the infection. Hepatitis A is the least serious form of hepatitis and can usually be treated with rest and supportive care. Vaccination is available to prevent infection with the virus. Vaccines are usually given in two doses and are most effective when given before exposure to the virus. Hepatitis B is a more serious form of hepatitis and is usually treated with antiviral medications. These medications can help reduce the symptoms of the infection and are often used in combination with other medications. Vaccines are available to prevent infection with the virus. Vaccines are usually given in three doses and are most effective when given before exposure to the virus. Hepatitis C is the most serious form of hepatitis and is usually treated with antiviral medications. These medications can help reduce the symptoms of the infection and are often used in combination with other medications. Vaccines are not available for hepatitis C.