Rabies, a relentless, ancient scourge, may hold a key to defeating another implacable foe: HIV. Scientists have used a drastically weakened rabies virus to ferry HIV-related proteins into animals, in essence, vaccinating them against an AIDS-like disease. Early evidence indicates that the vaccine -- which doesn't protect against infection -- prevents development of disease. Two years after the initial vaccination, four non-human primates were protected from disease, even after being "challenged" with a dangerous animal-human virus.
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