SEROLOGIC STRAIN DIFFERENTIATION IN TRACHOMA.

J Exp Med · 1964 · PMC2137777 · PMID 14217913

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may be significantno p-value reported

Furthermore, the volume of reagents needed is small so that little absorbing antigen is re- quired. The degree of antigenic variation, noted to be greater with the first of the two antisera obtained from the human volunteer, may be 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.