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Some Oral Poliovirus Vaccines Were Contaminated with Infectious SV40 after 1961
2005
Cancer Research
Some polio vaccines prepared from 1954 to 1961 were contaminated with infectious SV40. It has been assumed that all polio vaccines were SV40 free in the United States after 1961 and in other countries after 1962. Following a WHO requirement that was prompted by the detection of SV40 in some human tumors, we conducted a multilaboratory study to test for SV40 polio vaccines prepared after 1961. Vaccine samples from 13 countries and the WHO seed were initially tested by PCR. The possible presence
doi:10.1158/0008-5472.can-05-2028
pmid:16288015
fatcat:log3zvixjnhnjie4gpnn4np7py