helicobacter trogontum helicobacter trogontum helicobacter trogontum is a bacterium in the helicobacteraceae family, campylobacterales order. it was first isolated from rat intestine. it is gram-negative, its cells are rod-shaped with pointed ends, and its protoplasmic cylinder is entwined with periplasmic fibers. it is microaerophilic. the type strain is lrb 8581 (= atcc 700114). helicobacter trogontum scientific classification domain: bacteria phylum: campylobacterota class: "campylobacteria" order: campylobacterales family: helicobacteraceae genus: helicobacter species: h. trogontum binomial name helicobacter trogontummendes et al. 1996