A haemagglutination-inhibition test for the detection of yellow fever antibody in human sera is described. Parallel tests on 109 sera show agreement between the mouse-protection test and the haemagglutination-inhibition test in 90 per cent. of cases. Statistical analysis shows this result to be highly significant. Further work on the specificity of the reaction is required.
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J. S. Porterfield (1954) studied this question.
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