AIDS continues to mystify researchers. A overseas prostitute had her first HIV test seventeen years ago, she has yet to contract the virus despite servicing 10-15 men a day-the majority of these men tested positive for HIV. The percentage of "infected prostitutes" in her country eventually reached 90 percent. This prostitute contracted other STD's; proving that her partners didn't use condoms and she "was" exposed to HIV but "never" contracted it. Scientists came to the conclusion, if a sex worker didn't contract the virus after five years, they were unlikely to get it. In a similar case, an African prostitute slept with hundreds of men "unprotected" and allegedly infected her customers but she continues to test negative. She is resistant to the virus but was able to infect others. Even more frightening, ten years ago, a woman was infected with the "Group O" strain of AIDS. Although an individual has AIDS symptoms and a low T-Cell count, this particular strain tests "negative" on HIV tests. A person who tests negative (and is really positive) can unwittingly infect others because their AIDS test came back negative. This woman was quarantined.
http://www.aegis.com/news/vv/1999/VV991202.html
http://www.aegis.com/news/vv/1999/VV991202.html