Studies on entry and egress of poliomyelitic infection. IV. Atraumatic oral entry distribution of lesions and virus during the incubation period with notes on asymptomatic poliomyelitis.

J Exp Med · 1951 · PMC2136117 · PMID 14897993

Europe PMC DOI

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The sentences

probably not significantno p-value reported

During the first 7 days, no signs of infection were found in the CNS in 84 per cent of the animals examined, and in the remainder such lesions as were found were probably not significant.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.