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SUMMARY Various authors have described a group of organisms resembling Citrobacter freundii, but differing in several significant respects. It has been suggested that these organisms should be regarded as a new species, and the names Citrobacter koseri, Levinea sp. and Citrobacter diversus have been proposed for them. Representative strains described as C. koseri, L. malonatica, and C. diversus were shown to form a biochemically homogeneous group, and an antigenic-classification scheme is proposed for them. Strains of L. amalo-natica differed biochemically and serologically from the other strains studied and are excluded from the antigenic scheme.
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Gross et al. (1974) studied this question.
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