roseburia hominis roseburia hominis roseburia hominis is a bacterium first isolated from human feces. it is anaerobic, gram-negative or gram-variable, slightly curved rod-shaped and motile. the cells range in size from 0.5-1.5 to 5.0 μm. a2-183(t) (=dsm 16839(t)=ncimb 14029(t)) is the type strain. roseburia hominis scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: lachnospiraceae genus: roseburia species: r. hominis binomial name roseburia hominisduncan et al. 2006 it is being studied as a potential treatment for ulcerative colitis in pediatric patients ages 0 through 16 years.