We determined the prevalence of Helicobacter pylori infection in 755 patients with digestive complaints identified from laboratory records at the Pasteur Institute, Morocco from 1998 to 2007. Epidemiological factors and gastrointestinal conditions associated with this infection were also studied. All patients underwent endoscopy and diagnosis was by histology examination. The prevalence of H. pylori infection was 69%. The difference in prevalence between the age group 40-50 years and other age groups was statistically significant; gender had no significant association. H. pylori infection was found in 92% of chronic gastritis cases. The prevalence of H. pylori was significantly higher in the antrum (73%) than in the corpus (21%) and the pylorus (6%).

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The situation in which inhomogeneous radiation exposure is likely to occur with accidental overexposure was simulated by studying chromosome aberrations in mixtures of male irradiated and female nonirradiated lymphocytes. The data were evaluated by means of the contaminated Poisson method. For X-ray doses from 1 to 10 Gy and ratios of irradiated to nonirradiated blood from 1:1 to 1:19, a good agreement was found between calculated and applied radiation doses and fractions exposed.

Several determining factors were highlighted in the contamination of ground waters by these pollutants, namely: the contribution of nitrogenized fertilizers, the nature of soil, the lithology, the permeability of the aquifer and the outdistances well compared to the sources of pollution which are waste waters.

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