SUMMARY: Morphological and serological evidence is presented to demonstrate that an organism morphologically identical with Streptobacillus moniliformis is a stage intermediate to the L-form of a strain of Corynebacterium cervicis, that it is serologically closely related to a type culture of S. moniliformis, as well as to strains of Mycoplasma hominis; thus supporting the conclusion that L1, derived from S. moniliformis, and M. hominis have a similar origin, and suggesting that S. moniliformis is an intermediate stage between a Corynebacterium resembling C. cervicis and an L-form.
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