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Aids Transmission to Humans

Only Available in Archive Formats.
Aids Transmission to Humans

Aids Transmission to Humans

Aids Transmission to Humans

Only Available in Archive Formats.

NPR's Joe Palca reports on new studies that seem to disprove the theory that the virus that causes AIDS was first transmitted to humans in tainted polio vaccine during the late 1950's. The evidence against that theory appears in today's issue of the journal Nature.

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