Contagious Equine Metritis

概要

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An experiment was carried out to clarify morphological, serological and bacteriological characteristics of small and large colonial variants of Taylorella equigenitalis isolated from a laboratory strain. During subculture small colonial variants occurred spontaneously by a reversion from small to large colonies in vitro. They were convex, smooth, friable and colorless with entire edges and grew slower on ECA than the large colonial variants to reach a diameter of 0.7mm or less at 7 days of incubation. On the contrary, the large colonial variants were convex, smooth, viscid and grayish-white to light brown with entire edges and grew relatively rapid and 3 to 5mm in diameter at 7 days. Both colonial variants were visible on ECA at 3 days of incubation. When observed by the stereoscopic microscope, the small and large colonial variants were classified into the transparent and opaque phenotypes in opacity. No considerable difference was in biochemical characteristics between both colonial variants. Besides, these variants had a close antigenic relationship in the cross complement fixation and indirect hemagglutination tests.
日本ウマ科学会の論文