HIV, the virus that causes AIDS, shows high genetic variability. A number of types of this virus exist and are more or less widespread in different parts of the world. Subtype B is the dominant form in the West, where most of the drugs are developed and tested. However, 90 percent of the people infected with HIV carry other types of the virus that are common in Asia and Africa. Reservations unfounded Some experts feared that HIV therapies might be less effective against other types of the virus...
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