The human immunodeficiency virus (HIV) is retrovirus that causes infection and over time, Acquired immunodeficiency syndrome (AIDS). Without treatment, average survival is estimated to be 9 to 11 years. In most cases, HIV is a sexually transmitted infection, occuring by contact with or transfer of blood, pre-ejaculate, semen, and vaginal fluids. There are case of non-sexual transmission an infected mother to her infant through breast milk.
Hepatitis A is an infectious disease of the liver. In many cases there are few or no symptoms, especially in the young. Infections usually resolve completely and without ongoing liver disease, but sometimes a transplant is required. The hepatitis A vaccine is effective for prevention. Other preventive measures include hand washing and properly cooking food.