Study of Helicobacter pylori genotype status in cows, sheep, goats and human beings.
BACKGROUND
Helicobacter pylori is one of the most controversial bacteria in the world causing diverse gastrointestinal diseases. The transmission way of this bacterium still remains unknown. The possibility of zoonotic transmission of H. pylori has been suggested, but is not proven in nonprimate reservoirs. In the current survey, we investigate the presence of H. pylori in cow, sheep and goat stomach, determine the bacterium virulence factors and finally compare the human H. pylori virulence factors and animals in order to examine whether H. pylori might be transmitted from these animals to human beings.


METHODS
This cross- sectional study was performed on 800 gastric biopsy specimens of cows, sheep, goats and human beings. The PCR assays was performed to detection of H. pylori, vacA and cagA genes. The PCR products of Ruminant's samples with positive H. pylori were subjected to DNA sequencing analysis. Statistical tests were applied for data analysis.


RESULTS
Overall 6 (3%) cows, 32 (16%) sheep and 164 (82%) human beings specimens were confirmed to be H. pylori positive; however we were not able to detect this bacterium in all 200 goat samples. The vacA s1a/m1a was the predominant H. pylori genotype in all three kinds of studied population. There was 3.4-8.4% variability and 92.9-98.5% homology between sheep and human samples.


CONCLUSIONS
Considering the high sequence homology among DNA of H. pylori isolated from sheep and human, our data suggest that sheep may act as a reservoir for H. pylori and in the some extent share the ancestral host for the bacteria with human.
Hassan
H
Momtaz
Hossein
H
Dabiri
Young Researchers and Elite club, Central Tehran Branch, Islamic Azad University, P,O,Box: 13185-768, Tehran, Iran. negarsouod@yahoo.com.
Negar
N
Souod
Mohsen
M
Gholami
D000818:Animals; D000942:Antigens, Bacterial / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics*; D002417:Cattle; D003430:Cross-Sectional Studies; D004381:Duodenal Ulcer / Q000453:epidemiology / Q000473:pathology; D005756:Gastritis / Q000453:epidemiology / Q000473:pathology; D006041:Goats; D016481:Helicobacter Infections / Q000453:epidemiology / Q000382:microbiology* / Q000662:veterinary; D016480:Helicobacter pylori / Q000235:genetics*; D006801:Humans; D007492:Iran / Q000453:epidemiology; D016133:Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D012756:Sheep; D013270:Stomach / Q000382:microbiology* / Q000473:pathology; D013274:Stomach Neoplasms / Q000453:epidemiology / Q000473:pathology; D013276:Stomach Ulcer / Q000453:epidemiology / Q000473:pathology
D000942:Antigens, Bacterial; D001426:Bacterial Proteins; C074689:VacA protein, Helicobacter pylori; C080866:cagA protein, Helicobacter pylori