Robert gallo,the man who codiscovered the HIV virus, hopes a bold new approach may finally produce a vaccine to halt this killer. Twenty years after the global outbreak of AIDS, no one has developed an effective vaccine against the HIV virus, a far more cunning foe than polio, smallpox or measles. Though at least 30 different candidate vaccines have been tested in humans, only one has advanced to the final stages, and most scientists are skeptical that this one will work.
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