1. A genus of aerobic to facultatively anaerobic bacteria (family Enterobacteriaceae) containing gram-negative rods that are either motile or nonmotile; motile cells are peritrichous. These organisms do not liquefy gelatin or produce indole and vary in their production of hydrogen sulfide; they use citrate as a sole source of carbon; their metabolism is fermentative, producing acid and usually gas from glucose, but they do not attack lactose; most are aerogenic, but Salmonella typhi never produces gas; they are pathogenic for humans and other animals. The type species is Salmonella choleraesuis.
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