yersinia rochesterensis yersinia rochesterensis yersinia rochesterensis is a gram-negative, motile, rod-shaped bacterium that forms circular colonies and was isolated from human feces. this potentially pathogenic species has been isolated in human stools in france and in the united states where it was characterized at the mayo clinic. a y. rochesterensis strain, isolated from hare and initially identified as yersinia kristensenii, was serotyped as o:12,25. yersinia rochesterensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: enterobacterales family: yersiniaceae genus: yersinia species: y. rochesterensis binomial name yersinia rochesterensis(cunningham et al. 2019) nguyen et al. 2021