الفهرس 
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Abstract
The genus of Helicobacter consists of a group of microaerophilic, nonsporulating, Gram-negative rods that colonize on the mucus layer covering the epithelial surface of the gastrointestinal tract of humans and a variety of animal species. There are currently 6 validated Helicobacter species isolated from gastric tissue and 16 validated entero- hepatic species. Some Helicobacter species may be commonly (H. aurati) or occasionally (H. bilis and H. muridarum) isolated from both gastric and entero-hepatic sites from the zoonotic aspects and public health importance of H. pylori, recently the recovery of H. pylori from sheep by Dore et al. (1999) supported this hypothesis. Milk is considered as cultural and growth media for pathogenic microorganism, in Japan, milk (especially raw milk) and its products are indicated as vehicle for H. pylori. So, this study was conducted to investigate the following points : 1. Epidemiological study on the occurrence of H. pylori in cattle. 2. Epidemiological study on the occurrence of H. pylori in man. 3. Molecular characterization of H. pylori isolated from cattle and man using PCR and ERIC-P.