SUMMARY: Teichoic acid-lipid complexes from NCTC 6991 absorb to normal sheep red blood cells. Sensitized cells are agglutinated by specific antisera, the titres of representative sera being 1600 to 3200. Lipid-free teichoic acid does not sensitize red blood cells but inhibits haemagglutination. Haemagglutination is inhibited completely by intact cells of NCTC 6991, but only partially by other strains of Strains of lactobacilli of other serological groups absorb a variable proportion of antibody. The group F antigen is a membrane teichoic acid and the significance of the absorption by intact bacterial cells is discussed.


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