The experimental production of combination forms of virus. II. A study of serial passage in the allantoic sac of agents that combine the antigens of two distinct influenza A strains.

J Exp Med · 1953 · PMC2136272 · PMID 13069650

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The sentences

highly significantno p-value reported

( c ) X 3 virus, after several passages at limiting dilutions, was neutralized to a highly significant degree by specific M and W sera.

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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.