title: Characterization of an unclassified microaerophilic bacterium associated with gastroenteritis.
abstract: Four isolates of an unclassified microaerophilic bacterium resembling Campylobacter species were characterized by growth requirements, microscopic examination, biochemical characteristics, antimicrobial susceptibility tests, and protein profile analysis. The unclassified isolates were differentiated from Campylobacter jejuni, Campylobacter coli, Campylobacter fetus subsp. fetus, Campylobacter laridis, Campylobacter pylori, and an ovine isolate. The bacterium was fusiform shaped with a corrugated surface due to the presence of periplasmic fibers and had multiple bipolar flagella. Biochemically, the bacterium was separated from the Campylobacter controls by its negative catalase reaction, negative nitrate reduction, and no growth in 1% glycine. It was also resistant to ampicillin. Protein profile analysis demonstrated nine major protein bands present in the unclassified isolates that were absent in the Campylobacter controls. The bacterium also differed from the ovine isolate by its negative catalase reaction, rapid urea hydrolysis, and susceptibility to clindamycin, erythromycin, and tetracycline. Our results showed that the unclassified bacterium was distinct from the recognized Campylobacter species.
authors.affiliation: State Laboratory of Hygiene, University of Wisconsin, Madison 53706.
authors.forename: J R
authors.initials: JR
authors.lastname: Archer
authors.forename: S
authors.initials: S
authors.lastname: Romero
authors.forename: A E
authors.initials: AE
authors.lastname: Ritchie
authors.forename: M E
authors.initials: ME
authors.lastname: Hamacher
authors.forename: B M
authors.initials: BM
authors.lastname: Steiner
authors.forename: J H
authors.initials: JH
authors.lastname: Bryner
authors.forename: R F
authors.initials: RF
authors.lastname: Schell
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001419:Bacteria / Q000145:classification* / Q000166:cytology; D018407:Bacterial Physiological Phenomena; D001426:Bacterial Proteins / Q000032:analysis; D002167:Campylobacter / Q000502:physiology; D002374:Catalase / Q000378:metabolism; D004283:Dog Diseases / Q000382:microbiology*; D004285:Dogs; D005243:Feces / Q000382:microbiology; D005759:Gastroenteritis / Q000382:microbiology* / Q000662:veterinary; D005998:Glycine / Q000494:pharmacology; D006801:Humans; D009566:Nitrates / Q000378:metabolism; D013696:Temperature
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D009566:Nitrates; D002374:Catalase; D005998:Glycine