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Maurice was one of the early vaccine pioneers to warn about the possibility that simian viruses might contaminate vaccines.[7] The best-known of these viruses became SV40, a viral contaminant of the polio vaccine, whose discovery led to the recall of Salk's vaccine in 1961 and its replacement with Albert Sabin's oral vaccine. The contamination actually occurred in both vaccines at very low levels, and, because they were ingested rather than injected, did not result in infections or any harm.
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