Abstract

Fifty-three human sera were examined for antibodies agglutinating erythrocytes sensitized with 3 different membrane teichoic acids from lactobacilli. Of the 32 sera containing detectable antibodies, 17 reacted with each of the teichoic acids. An examination of representative sera indicated that there were antibodies cross-reacting with the 3 teichoic acids and also with presumptive teichoic acids present in extracts of 3 oral streptococci. These results indicate that the reaction of a cell extract with a particular human serum does not necessarily indicate infection by that organism.

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