Abstract
Summary
Sixteen strains of Hemophilus influenzae, type B were used for bactericidal assays with sera from six healthy adults. Two strains were killed by all six human sera and by normal rabbit sera while the other 14 strains were killed only by three human sera. Absorption experiments suggested a diversity of antibodies among the human sera, since treatment with capsular material removed bactericidal activity from one, but left it unaffected in two others. These findings are important for the evaluation of surveys of the prevalence of H. influenzae, type B bactericidal antibodies.
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