The Gram-negative Bacteroides of the Intestine

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Abstract
In agreement with the observations of Eggerth and Gagnon, representatives of the Gram-negative Bacteroides group were found to be the predominant organisms in most of the stools examined. The Gram-positive members of the group are quite distinct from the Gram-negative. Following a comprehensive morphological, cultural and serological study, the Gram-negative strains were divided into 4 sub-groups or species based primarily on agglutinations, secondly on morphology. Group I (Bacteroides vul-gatus) is made up of solid-staining rods appearing singly or in pairs. Group II (Bacteroides varius) consists largely of granular-staining rods, usually occurring in clusters. Group III (Bacteroides uncatus) members arc slender, pointed bacilli, morphologically resembling the genus Fusiformis. Group IV contains several strains which resemble Group II morphologically, but do not fall in that group serologically. This classification seems more appropriate than one based on cultural reactions.

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