gastric spiral bacilli in captive cheetahs.two kinds of gastric spiral bacilli were identified in the stomachs of captive cheetahs with naturally occurring gastritis. one type was morphologically similar to 'gastrospirillum hominis'. this organism could not be cultured in vitro. some of these bacteria had superficial helical filaments, and others did not. the other type was morphologically, biochemically, and bacteriologically similar to helicobacter pylori. this organism is most likely a new species of helicobacter. one or both of these ...19911866593
helicobacter acinonyx sp. nov., isolated from cheetahs with gastritis.four strains of a novel helicobacter species were isolated from the stomachs of cheetahs (acinonyx jubilatus) with gastritis. these isolates were phenotypically similar to helicobacter pylori. the isolates were gram-negative, spiral bacteria which grew under microaerophilic conditions at 37 degrees c, but not at 25 or 42 degrees c, and produced urease, catalase, oxidase, alkaline phosphatase, and gamma-glutamyl transpeptidase. the isolates did not ferment glucose, mannitol, inositol, sorbitol, r ...19938379970
the expanding genus of helicobacter: pathogenic and zoonotic potential.the microbial flora of stomachs of humans and animals have been the focus of considerable research since the discovery that helicobacter pylori in humans caused a variety of gastric diseases. other helicobacter species have now been isolated from the stomachs of various mammals, including dogs, cats, ferrets, pigs, monkeys, and cheetahs, all of which are associated with various degrees of gastritis in their hosts. helicobacter species have also been isolated from the intestinal tracts of humans, ...19979232726
the role of helicobacter species in newly recognized gastrointestinal tract diseases of animals.because helicobacter pylori is now known to be a significant human pathogen, experimental animal models are increasingly being used to study the pathogenesis of this organism. unfortunately, early studies failed to establish h. pylori in animal models, and surprisingly, koch's postulates were initially fulfilled in two human volunteers. germfree experiments performed in pigs and pups however established that h. pylori would colonize in these animals, and gastritis was induced. certain macaque sp ...19979241625
chronic gastritis in tigers associated with helicobacter acinonyx.helicobacter pylori-like organisms (hplos) were isolated from the gastric mucosa of two sumatran tigers and identified by polymerase chain reaction analysis as helicobacter acinonyx. at histological examination, both tigers revealed a chronic gastritis associated with hplos as demonstrated by immunolabelling and electron microscopy. this is the first isolation of h. acinonyx from tigers, in which, as previously reported in cheetahs, it may be a cause of gastritis.19989717128
the 26-kilodalton, ahpc homologue, of helicobacter pylori is also produced by other helicobacter species.the 26 kda protein, which is an alkyl hydroperoxide reductase (ahpc) homologue, has earlier been described as specific for helicobacter pylori. the aims of this study were to analyse whether this protein, or the corresponding gene, could be identified in other helicobacter species.200111328365
are goats naturally resistant to gastric helicobacter infection?gastric helicobacter species are widespread and have been reported in wild and domestic mammals of different dietary habits such as humans, dogs, cats, macaques, mice, cheetahs, ferrets, swine and cattle. all have been associated with gastric pathologies. recently, gastric helicobacter species were shown to be widespread in cattle and swine in europe, and there is a report of helicobacter pylori in sheep in italy. however, there are no reports of helicobacter infection in the goat, another impor ...200211731164
helicobacter acinonychis: genetic and rodent infection studies of a helicobacter pylori-like gastric pathogen of cheetahs and other big cats.insights into bacterium-host interactions and genome evolution can emerge from comparisons among related species. here we studied helicobacter acinonychis (formerly h. acinonyx), a species closely related to the human gastric pathogen helicobacter pylori. two groups of strains were identified by randomly amplified polymorphic dna fingerprinting and gene sequencing: one group from six cheetahs in a u.s. zoo and two lions in a european circus, and the other group from a tiger and a lion-tiger hybr ...200414702304
who ate whom? adaptive helicobacter genomic changes that accompanied a host jump from early humans to large felines.helicobacter pylori infection of humans is so old that its population genetic structure reflects that of ancient human migrations. a closely related species, helicobacter acinonychis, is specific for large felines, including cheetahs, lions, and tigers, whereas hosts more closely related to humans harbor more distantly related helicobacter species. this observation suggests a jump between host species. but who ate whom and when did it happen? in order to resolve this question, we determined the ...200616789826
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