QUANTITATIVE ASPECTS OF THE RED BLOOD CELL AGGLUTINATION TEST FOR INFLUENZA VIRUS.

J Exp Med · 1944 · PMC2135446 · PMID 19871362

Europe PMC DOI

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may be significantno p-value reported

In order that such tests may be significant, it is essential that the substances under study do not lose activity during the period required for the isolation and the test, and that the biological test be sufficiently sensitive and accurate.

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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.