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1 Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, 00581 Helsinki, Finland
2 Department of Veterinary Clinical Sciences, Faculty of Veterinary Medicine, University of Helsinki, 00581 Helsinki, Finland
3 Institute of Pathology, Faculty of Veterinary Medicine, University of Helsinki, 00581 Helsinki, Finland
* Corresponding author. Mailing address: Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, P.O. Box 6, 00581 Helsinki, Finland, Phone: 358-0-70849704. Fax: 358-0-70849718.
ABSTRACT
Organisms whose cells were large, tight spirals were isolated from gastric biopsies of dogs. Touch cytology samples from all of the dogs contained large spiral organisms. Characteristics of 10 strains are described. These organisms were 5 to 10 µm long by 0.3 µm wide, and each cell had 10 to 20 sheathed flagella at both ends of the cell. The cells did not have periplasmic fibrils. These organisms were microaerophilic and grew at 37 and 42°C but not at 25°C on brain heart infusion agar containing blood. They did not grow on brucella blood agar. They were catalase and oxidase positive, hydrolyzed urea but not hippurate, reduced nitrate, and were resistant to nalidixic acid but susceptible to cephalothin and metronidazole. In contrast to Helicobacter felis, they hydrolyzed indoxyl acetate. The sodium dodecyl sulfate-polyacrylamide gel electrophoresis protein profiles of all of the strains were similar, and the protein patterns of these organisms differed from those of other Helicobacter spp. Dot blot DNA-DNA hybridization experiments revealed that the new strains were closely related to each other but clearly different from H. felis, Helicobacter pylori, Helicobacter mustelae, and Campylobacter jejuni. The name Helicobacter bizzozeronii sp. nov. is proposed for these organisms. Our results suggest that other "uncultured" gastric helicobacters may be cultured if optimal culture conditions are found.
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