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After 40 years of AIDS, here's why we don't have an HIV vaccine


3 hours ago
Forty years ago, researchers described the mysterious cases of five gay men who had fallen ill with a pneumonia caused by the bacteria
Pneumocystis carinii. Two of the five men had already died.
Morbidity and Mortality Weekly Report. Scientists would soon discover that a disease that would come to be known as AIDS was devastating the men’s immune systems.
Three years later, scientists pinned the blame for AIDS on a virus dubbed HIV, or human immunodeficiency virus. Margaret Heckler, the then-U.S. Secretary of Health and Human Services, said in an April 1984 news conference that a vaccine to build protection against the virus would be ready to test within two years, holding out promise that protection was on its way.    ....

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