bifidobacterium tsurumiense bifidobacterium tsurumiense bifidobacterium tsurumiense is a gram-positive, rod-shaped species of bacteria. strains of this species were originally isolated from dental plaques from golden hamsters. bifidobacterium tsurumiense scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: bifidobacteriales family: bifidobacteriaceae genus: bifidobacterium species: b. tsurumiense binomial name bifidobacterium tsurumienseokamoto et al. 2008