Deoxyribonucleic Acid Relatedness Between Serratia plymuthica and Other Serratia Species, with a Description of Serratia odorifera sp. nov. (Type Strain: ICPB 3995)

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Abstract
Seven new isolates of S. plymuthica (including 2 from a human source) and 24 isolates resembling unclustered Serratia strain 38 are described. DNA relatedness studies, obtained with labeled reference from S. plymuthica 392 confirm that S. plymuthica is a discrete species. Mean percent relatedness of S. plymuthica isolates to strain 392 was 88 .+-. 13.6 (SD), whereas the mean percent relatedness of S. liquefaciens isolates (the closest species) to strain 392 was 52 .+-. 12.4. Strain 38 and 24 "38-like" isolates constitute a new DNA hybridization group that is 28-43% related to Serratia spp. and to the Citrobacter-like group of Leclerc and Buttiaux, and 15-22% related to other known species of Enterobacteriaceae. This 38-like group constitutes a new species that is named S. odorifera sp. nov. (type strain, ICPB 3995). Two biotypes (1 and 2) are described. Strains of this species will grow on carylate-thallous agar (selective for Serratia spp.), and they have a characteristic odor. Most strains of S. odorifera were recovered from clinical specimens.

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