An Investigation of the Bacillus Pasteuri Group

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Abstract
Type cultures were examined and compared with recently-isolated strain;-. The group may be divided into 3 moderately distinctive species: (1) B. pasteuri, (2) B. loehnisii (p. 495) and (3) B. jreudenrcichii. Spores are spherical or slightly ovoid in (1) and (2) and ovoid to elliptical in (3). Urea is decomposed rapidly by (1) and slowly by (2) and (3). Growth in ordinary neutral media is usually possible only for (2) and (3). Urobacillus leubei is regarded as a synonym of B. freudenreichii. Urobac. psychrocartericus and Urobac. hesmogenes are probably synonyms of B. pasteuri; and several other previously-named bacteria appear to belong to this group. B. sphaericus and other organisms closely related to the pasteuri group cannot be differentiated from the latter except by their inability to decompose urea or by their failure to show a preference for alkaline media containing ammonia. There is apparently no group of urea-decomposing bacteria sufficiently well defined to deserve the generic term Urobacillus.