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AIDS and the Black Death
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Sir,
Cohn and Weaver1 assert that recent publications suggesting that the medieval Black Death could be responsible for the origin of the CCR5-
32 allele24 are mistaken. They say: scientists ... have assumed that the north-south European geographical cline in the frequency of the CCR5-
32 allele among present-day descendents parallels the severity of the Black Death in 1348
Valdosta State University
Valdosta
Georgia
USA
email: bhbossak@valdosta.edu