Seven new isolates of (including two from a human source) and 24 isolates resembling unclustered strain 38 (Grimont et al., J. Gen. Microbiol 98:39-66, 1977) are described. Deoxyribonucleic acid relatedness studies, obtained with labeled reference deoxyribonucleic acid from 392 confirm that is a discrete species. Mean percent relatedness of isolates to strain 392 was 88 ± 13.6 (standard deviation), whereas the mean percent relatedness of isolates (the closest species) to strain 392 was 52 ± 12.4. Strain 38 and twenty-four “38-like“ isolates constitute a new deoxyribonucleic acid hybridization group that is 28 to 43% related to species and to the “-like” group of Leclerc and Buttiaux, and 15 to 22% related to other known species of This 38-like group constitutes a new species that is named sp. nov. (type strain, ICPB 3995). Two biotypes (1 and 2) are described. Strains of this species will grow on caprylate-thallous agar (selective for , and they have a characteristic odor. Most strains of were recovered from clinical specimens.


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