Human immunodeficiency virus infection
HIV infection is a disease caused by the human immunodeficiency virus (HIV). The condition gradually destroys the immune system, which makes it harder for the body to fight off infections.
This article provides a general overview. For more detailed information, see:
The human immunodeficiency virus (HIV) can be spread by the following:
The virus may also spread from the mother to her baby, either at birth or through breastfeeding.
People who become infected with HIV may have no symptoms for up to 10 years, but they can still pass the infection to others. After being exposed to the virus, it usually takes about 3 months for blood test results to change from HIV negative to HIV positive.
HIV has spread throughout the US. Higher concentrations of the disease are found in inner cities.
Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, PA: Saunders Elsevier; 2007: sect XXIV.