Evidence is presented for the recognition of a new species of isolated from abscess foci in an Amazon freshwater dolphin, The organism appears to be immunologically distinct from members of the recognized Lancefield groups of streptococci. Antigens prepared by five different extraction procedures do not react with antisera to groups A to U, whereas antisera prepared against the new isolate react well with the extracted homologous antigens but not with antigens from groups A to U. Based on cultural, morphological, biochemical, and serological results, it is suggested that this isolate belongs to a new species for which we propose the name The type strain of this new species is strain PW (=ATCC 29178).


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