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The name Proteus penneri sp. nov. is proposed for a group of organisms previously called Proteus vulgaris indole negative or P. vulgaris biogroup 1. All of these strains were salicin negative, esculin negative, and chloramphenicol resistant (zone size, less than 14 mm). DNA relatedness studies indicated that when DNA from P. penneri strain 1808-73 was labeled and tested against unlabeled DNA from 13 other P penneri strains, a highly related group was formed (88 to 99% relatedness at 60 degrees C and 67 to 99% relatedness at 75 degrees C). Strain 1808-73 (ATCC 33519) is proposed as the type strain of P. penneri. In this study, two distinct groups of indole-positive P. vulgaris strains were also apparent. The first group (defined as P. vulgaris biogroup 2) was indole positive, salicin positive, and esculin positive, and the second group (defined as P. vulgaris biogroup 3) was indole positive, salicin negative, and esculin negative. The current type strain of P. vulgaris (ATCC 13315) belongs to biogroup 3. The DNA from P. penneri strains was not highly related to labeled DNA from the type strain of P. vulgaris (14 to 30% relatedness at 75 degrees C) or from P. vulgaris strain PR 1 (ATCC 29905), which belongs to biogroup 2 (27 to 33% relatedness at 75 degrees C). Strains of biogroup 2 were sensitive to chloramphenicol (zone size, greater than 19mm), and 10 of these strains formed a highly related group by DNA hybridization when DNA from PR 1 was labeled (64 to 100% relatedness at 60 degrees C and 70 to 100% relatedness at 75 degrees C), but they were not highly relatedness to the type strain of P. vulgaris (51 to 68% relatedness at 60 degrees C and 14 to 44% relatedness at 75 degrees C). Further DNA relatedness studies are needed on strains of biogroup 3 before a definitive taxonomic proposal can be made for these two indole-positive biogroups.

Identification of Proteus penneri sp. nov., formerly known as Proteus vulgaris indole negative or as Proteus vulgaris biogroup 1