RESUMEN
The mode of the transmission of Helicobacter pylori infection remains poorly understood. A total of 198 samples of drinking water from 22 districts of Basra governorate were collected during the period October 2006 to July 2007. The concentration of residual chlorine was measured and the numbers of total and faecal coliforms were counted. On modified Columbia urea agar, 469 bacterial cultures were obtained, of which 173 isolates were identified. Only 14 isolates were Helicobacter spp., of which 10 were H. pylori [2.0% of the total isolates]. These isolates were tested for antibiotic susceptibility as well as ability to tolerate chlorine at 0.5 mg/L. To our knowledge, this is the first report of the occurrence of H. pylori in treated municipal drinking water