ABSTRACT
Helicobacter species have been found in the feces of terns, gulls, house sparrows, and pigs, and a Helicobacter species distinct from H. mustelae has been found in ferret feces. The main morphological distinction of Helicobacter genus is the possession of sheathed flagella, with a membranous terminal bulb, which is an extension of the sheath; these features have been found in Helicobacter fennelliae, but Helicobacter cinaedi has sheathed flagella but no terminal bulb. Helicobacter muridarum was cultured in Sydney about the same time as Helicobacter pylori. In 1983, Marshall moved to Fremantle Hospital, and wrote the first published description of the culture of H. pylori. In 1985, H. pylori were reported to exhibit a new profile of cellular fatty acids characterized by relatively large amounts of tetradecanoic, octadecanoic, and 19-carbon cyclopropane fatty acids. Twenty-three human isolates of H. pylori were studied by G. Bukholm et al. and found to be a homogeneous taxonomic unit.
