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By gel-diffusion precipitin and absorption tests six antigens were identified in group D streptococci of human oral origin that were common to Haemophilus influenzae; four of these were common also to Mycoplasma hominis, and three to the l-form of a group A streptococcus. No cross-reactions were obtained with Corynebacterium xerosis or C. hofmannii. These antibodies occurred in commercial Streptococcus and Haemophilus typing sera, but not in enterobacterial agglutinating sera.
It should be concluded that the genus Haemophilus and Mycoplasma hominis are more closely related to the genus Streptococcus than to the genus Corynebacterium.
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