A mycoplasma designated strain 383(T = type strain) was isolated from the cloaca of a turkey poult. After examination of its morphological, physical, and cultural properties this organism was assigned to the class , order The base composition of its deoxyribonucleic acid was 26.0 mol% guanine plus cytosine. Strain 383was dependent on sterol for growth and was inhibited by digitonin. Since it gave no evidence of helical forms or of urea hydrolysis, it was assigned to the family , genus This organism hydrolyzed arginine and reduced triphenyltetrazolium chloride under anaerobic conditions, but other biochemical tests were negative. Strain 383could not be identified as any of 83 currently accepted . species or serovars by growth inhibition, immunofluorescence, immunodiffusion, or metabolism inhibition tests. Thus, this mycoplasma appears to be a new species, for which we propose the name ; the type strain is strain 383 (= NCTC 10199 = ATCC 35276).


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