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A soluble polysaccharide antigen from the cell wall of Rothia dentocariosa ATCC 17931 has been isolated, purified and characterized by serological and chemical procedures. The polysaccharide (RPS) was found to be located at the surface of cells grown under diverse environmental conditions, and could be easily detected on cells in pure culture or in clinical samples from humans and experimentally infected hamsters by fluorescent-antibody techniques. Fructose, glucose, galactose, and ribose were the major constituents of RPS. Although purified RPS was not immunogenic in rabbits, it was presumed to be a major antigen of the cell because it could specifically absorb approximately one-third of the antibody nitrogen in antisera prepared against whole cells of R. dentocariosa. Haptene inhibition studies indicated that fructose was the principal determinant of serological specificity in RPS. This polysaccharide was found to be serologically unique and did not cross-react with the polysaccharides and surface polymers of other oral actinomycetes and filamentous organisms.

Isolation and Serological Characterization of a Cell Wall Antigen ofRothia dentocariosa