Definition: A genus of motile, peritrichous, non-spore-forming, aerobic or facultatively anaerobic bacteria (family Enterobacteriaceae) containing gram-negative rods. These organisms do not hydrolyze urea nor produce hydrogen sulfide; they produce indole and grow on Simmons citrate medium. They do not decarboxylate lysine, arginine, or ornithine. These organisms occur in specimens from extraintestinal sources, particularly urinary tract infections; they have also been isolated from small outbreaks and sporadic cases of diarrheal disease. The type species is Providencia alcalifaciens.
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Examples: glitazone, GI cocktail, etc.