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Early in his career at the FDA, Petricciani discovered that bacteriophages (a virus that parasitizes a bacterium by infecting it and reproducing inside of it) were a common contaminant of childhood vaccines. His initial reasoning was that bacteriophages were normal flora in the human intestine and were unlikely to be a serious health risk to children receiving the vaccines. Nevertheless, studies in small animals and monkeys were undertaken and after years of observation, there was no evidence of harm from bacteriophages.
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