What is a virus, Virus Structure, Genetic Material, Origin of virus, viruses, VIH, AIDS, Infection by VIH, Transmition and prevention, Sexual contact, Exposure to infected body fluids, Mother-to-child transmission, MTCT, Epidemiology, Tropism, Entry to the cell, Replication and transcription, Reproductive cycle of the virus, Clinical latency, Symptoms of early infection, The declaration of AIDS, Treatment, T-cell, Antirretroviral drug, Combination therapy, ELISA method.