Word: burnet
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Dates: during 1990-1999
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...contracted and then passed on, the team reported last week in Science, contains flaws in its genetic script that appear to have rendered it innocuous. "Not only have the recipients and the donor not progressed to disease for 15 years," marvels molecular biologist Nicholas Deacon of Australia's Macfarlane Burnet Centre for Medical Research, "but the prediction is that they never will." Deacon speculates that this "wimpy" HIV may even be a natural inoculant that protects its carriers against more virulent strains of the virus, much as infection with cowpox warded off smallpox in 18th century milkmaids...