Abstract
Human Immunodeficiency Virus (HIV) is transmitted via body fluids, through behaviours such as unprotected sexual contact and sharing of intravenous injection equipment, or through transfusion with infected blood products. Initial infection may cause an acute mononucleosis-like illness within several weeks to months, lasting a week or two. Infected people are then usually free of symptoms for many months or years. However, the immune system becomes progressively damaged by the virus, eventually leading to the development of one or more opportunistic infections and cancers.
