Ureaplasma strains isolated from dogs () were characterized and compared with the type strains of five previously described species of the genus (isolated from humans), (isolated from cattle), (isolated from chickens), (isolated from cats), and (isolated from cats). The canine strains hydrolyzed urea but not arginine or glucose, were membrane bound, lacked a cell wall, passed through 450-nm-pore-size membrane filters, required cholesterol for growth, and formed minute colonies (diameter, 20 to 140 μm) on agar medium. These canine ureaplasma strains have been reported to be members of four serovars. The four serovars of canine strains fell into a single group on the basis of their genomic properties, as determined by DNA-DNA hybridization. On the basis of these findings, we propose that ureaplasmas with these characteristics belong to a new species, , with strain D6P-C (= ATCC 51252) as the type strain.


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