bartonella peromysci bartonella peromysci bartonella peromysci, formerly belonging to the grahamella genus, is a bacterium. as with other bartonella species, it can cause disease in animals. bartonella peromysci scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: bartonellaceae genus: bartonella species: b. peromysci binomial name bartonella peromysci(birtles et al. 1995)