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Journal of Clinical Microbiology, May 2000, p. 1811-1817, Vol. 38, No. 5
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Helicobacter mesocricetorum sp. nov., a Novel Helicobacter Isolated from the Feces of Syrian Hamsters

J. H. Simmons,* L. K. Riley, C. L. Besch-Williford, and C. L. Franklin

Department of Veterinary Pathobiology, University of Missouri---Columbia, Columbia, Missouri 65211

Received 21 October 1999/Returned for modification 6 February 2000/Accepted 26 February 2000

A spiral-shaped bacterium with bipolar, single, nonsheathed flagella was isolated from the feces of Syrian hamsters. The bacterium grew as a thin spreading film at 37°C under microaerobic conditions, did not hydrolyze urea, was positive for catalase and alkaline phosphatase, reduced nitrate to nitrite, did not hydrolyze hippurate, and was sensitive to nalidixic acid but resistant to cephalothin. Sequence analysis of the 16S rRNA gene and biochemical and phenotypic criteria indicate that the novel bacterium is a helicobacter. The novel bacterium is most closely related to the recently described mouse enteric helicobacter, Helicobacter rodentium. This is the first urease-negative Helicobacter species with nonsheathed flagella isolated from feces of asymptomatic Syrian hamsters. We propose to name this novel helicobacter Helicobacter mesocricetorum. The type strain is MU 97-1514 (GenBank accession number AF072471).

* Corresponding author. Mailing address: Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri---Columbia, Columbia, MO 65211. Phone: (573) 882-1514. Fax: (573) 884-7521. E-mail: simmonsjh{at}missouri.edu.

Journal of Clinical Microbiology, May 2000, p. 1811-1817, Vol. 38, No. 5
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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