Treatment for AIDS
AIDS is a fatal disease and no complete cure for AIDS is known although research is very extensive in the area of vaccine production and chemotherapy. Several drug have been identified which usually delay symptoms and in some cases prolong the life of those infected with HIV. These drugs fall into three major categories .

The genetic variability of HIV hampers the development of vaccine against AIDS. However, the most impressive results from clinical trials for immunization have emerged from subunit vaccines where genes for may HIV envelop proteins have been engineered into vaccinia virus or adenoviruses. When these harmless viruses have been used as expression vectors and carriers for delivery of HIV-antigens, several subunit vaccines elicited potent humoral and cellular immune response to HIV.