This article is from the Scientific Skepticism FAQ, by Paul Johnson Paul@treetop.demon.co.uk with numerous contributions by others.
The generally accepted theory is that AIDS is caused by the Human
Immunodeficiency Virus (HIV). There are two different versions of
HIV: HIV-1 and HIV-2. These viruses are believed, on the basis of
their genetic sequences, to have evolved from the Simian
Immunodeficiency Virus (SIV), with HIV-2 being much more similar to
SIV. Several years after the initial HIV infection, the immune system
is weakened to the point where opportunistic infections occur,
resulting in the syndrome of AIDS. A good reference for more
information on the "mainstream" view of AIDS is:
The Science of AIDS : readings from Scientific American magazine.
New York : W.H. Freeman, c1989.
 
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