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1Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, FIN-00014 Helsinki University, Finland
3Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Helsinki, FIN-00014 Helsinki University, Finland
2Faculty of Medicine, Haartman Institute, University of Helsinki, FIN-00014 Helsinki University, Finland
* Corresponding author. Mailing address:Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, P.O. Box 57, FIN-00014 Helsinki University, Finland. Phone: 358-9-70849705. Fax: 358-9-70849718. E-mail: Katri.Jalava{at}Helsinki.fi.
ABSTRACT
During a study of the prevalence and distribution of gastric helicobacters in domestic pets, a novel group of Helicobacter-like organisms were identified. These "Helicobacter group 2 strains were initially distinguished from the species Helicobacter felis and Helicobacter bizzozeronii by their cellular morphology and the type of motility exhibited. Bacterial cells were only slightly spiral, 5 to 7 µm long, and 0.8 to 1.2 µm wide and showed an unusual slow wavelike motion. Each cell had tufts of sheathed flagella at one or both ends. Phylogenetic analysis by 16S ribosomal DNA sequence comparison revealed that H. felis, H. bizzozeronii, "Gastrospirillum hominis" 2, and the new group of helicobacters formed a distinct cluster with intraspecies similarity values of more than 98%. These taxa were clearly separated from all other known Helicobacter species. Dot blot DNA-DNA hybridization studies indicated that the Helicobacter group 2 strains are genetically homogeneous and distinct from other canine and feline gastric helicobacters. Quantitative DNA-DNA hybridization experiments showed that Helicobacter group 2 strains exhibit >;90% DNA homology to each other, but <39% homology to the phylogenetically related taxa H. felis and H. bizzozeronii. We propose the name Helicobacter salomonis for the novel Helicobacter group 2 strains. The type strain is H. salomonis Inkinen (= CCUG 37845).
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