This study provides evidence that flies can contaminate food with poliomyelitis virus during an epidemic, potentially serving as a vector for transmission.
Fly vector role in polio remains unproven in humans; leaves open need for epidemiological confirmation before any practice change.
Poliomyelitis virus has been detected in food exposed to flies at homes of poliomyelitis patients within an epidemic area. This was achieved by feeding such exposed food to chimpanzees which developed subclinical infections or asymptomatic carrier states ascertained by positive stool tests in rhesus monkeys.
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Ward et al. (1945) studied this question.
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