helicobacter anseris helicobacter anseris helicobacter anseris is a bacterium in the helicobacteraceae family, campylobacterales order. it is gram-negative, microaerophilic, spiral to curve-shaped, being first isolated from the faeces of geese. helicobacter anseris scientific classification domain: bacteria phylum: campylobacterota class: "campylobacteria" order: campylobacterales family: helicobacteraceae genus: helicobacter species: h. anseris binomial name helicobacter anserisfox et al. 2006