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Abstract
In 1900, Tissier described a new bacterium, Coccobacillus anaerobius perfoetens, that he isolated from an infant with diarrhea and, in 1905, from nursing infants. This organism was placed by Hauduroy et al. (1937) in the genus Bacteroides, by Sebald (1962) in Sphaerophorus, and then by Moore and Holdeman (1973) in the genus Fusobacterium. Sphaerophorus perfoetens CC1, isolated in 1947 by Prévot from the cecum of a horse and studied by Sébald in 1962, has been lost. Since then, no strains conforming to the description of Tissier's organism have been known to be extant. However, recently we obtained from a normal piglet six isolates that conform to the original and subsequent descriptions of this organism. One of these isolates, PVA B3/63, is designated as the neotype strain of Fusobacterium perfoetens and is available from the American Type Culture Collection as ATCC 29250.
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