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1The Laboratory of Research in Bacteriology, Faculdade de Medicina/UFMG, Belo Horizonte, MG, 30130-100, Brazil
2Department of Molecular Genetics, Forsyth Dental Center, Boston, Massachusetts 02115
3Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
* Corresponding author. Mailing address: Division of Comparative Medicine, Massachusetts Institute of Technology, Bldg. 45, 77 Massachusetts Avenue, Cambridge MA 02139. Phone: (617) 253-1735. Fax: (617) 252-1877.
ABSTRACT
A new Helicobacter species that colonizes the colonic mucosa of Wistar and Holtzman rats was isolated and characterized. This bacterium was gram negative, its cells were rod shaped with pointed ends, and its protoplasmic cylinder was entwined with periplasmic fibers. It was catalase and oxidase positive, rapidly hydrolyzed urea, and was susceptible to metronidazole and resistant to cephalothin and nalidixic acid. The new organism was microaerophilic and grew at 42°C, a feature that differentiates it from two other murine intestine colonizers, Helicobacter hepaticus and Helicobacter muridarum. On the basis of 16S rRNA sequence analysis data, the new organism was identified as a Helicobacter species that is most closely related to H. hepaticus. This bacterium is named Helicobacter trogontum. The type strain is strain LRB 8581 (= ATCC 700114).
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