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1School of Microbiology and Immunology, University of New South Wales, Sydney, New South Wales, Australia 2033
6Electron Microscopy Unit, University of New South Wales, Sydney, New South Wales, Australia 2033
2Forsyth Dental Center, Boston, Massachusetts 02115
3Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
4Department of Microbiology, University of Queensland, St. Lucia, Queensland, Australia 4067
5Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2
* Corresponding author.
ABSTRACT
Helical organisms with novel ultrastructural characteristics were isolated from the intestinal mucosa of rats and mice. These bacteria were characterized by the presence of 9 to 11 periplasmic fibers which appeared as concentric helical ridges on the surface of each cell. The cells were motile with a rapid corkscrewlike motion and had bipolar tufts of 10 to 14 sheathed flagella. The bacteria were microaerophilic, nutritionally fastidious, and physiologically similar to Helicobacter species and Wolinella succinogenes but could be differentiated from these organisms by their unique cellular ultrastructure. Using 16S rRNA sequencing, we found that strain ST1T (T = type strain) was related to previously described Helicobacter species, "Flexispira rappini," and W. succinogenes. The closest relatives of strain ST1T were Helicobacter mustelae and "F. rappini" (average similarity value, 96%). On the basis of phylogenetic data, strain ST1T (= ATCC 49282T) represents a new species of the genus Helicobacter, for which we propose the name Helicobacter muridarum.
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