helicobacter cholecystus helicobacter cholecystus helicobacter cholecystus is a bacterium first isolated from gallbladders of golden hamster with cholangiofibrosis and centrilobular pancreatitis. it is filamentous, gram-negative, and motile, with a single polar-sheathed flagellum. it is also microaerophilic. helicobacter cholecystus scientific classification domain: bacteria phylum: campylobacterota class: "campylobacteria" order: campylobacterales family: helicobacteraceae genus: helicobacter species: h. cholecystus binomial name helicobacter cholecystusfranklin et al. 1997