Proteus vulgaris is one of the three Proteus bacteria that is humanly pathogenic. Proteus spp are members of the Proteus-Providencia group of the enterobacteriaciae, are oxidase-negative, catalase-positive, urease-positive (Salmonella are urease-negative), may be motile and ‘swarm’ on agar plates.
Proteus vulgaris are indole-positive, unlike P. mirabilis and P. penneri.
Proteus species are frequently isolated from the genitourinary tract.
Susceptibility
Wild type P. vulgaris is and AmpC producing species (indole-positive Proteus). P. vulgaris produces a class A cefuroximase conferring resistance against amoxicillin, cefalotin and cefuroxim. Natural resistance exists also against the polymixins like colistin and furans like nitrofurantoin like other Proteus species.
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