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Chapter 16.7 : Plague—Yersinia pestis
Yersinia pestis is a nonmotile, slow-growing, facultative organism classified in the family Enterobacteriaceae. It appears as plump, Gram-negative coccobacilli that are seen mostly as single cells or pairs, which may exhibit bipolar staining from a direct specimen if stained with Wright stains. This appearance has been referred to as “safety pin-like.”