The public anxiety, even hysteria, touched off by AIDS is understandable, if lamentable. The disease was identified just over four years ago, and much about the ways in which it spreads remains obscure. No one knows, for example, why it strikes women and men in about equal numbers in Central Africa, where the disease appears to have originated, while in the U.S. only about 7% of the 13,000 victims identified so far have been women. There are theories but no proof. Nonetheless, a review of the facts establishes that public fears are vastly overblown. The ways in which AIDS is known...
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