In 1990-1991 microbiological studies were performed aimed at determination of frequency of occurrence of Helicobacter pylori in patients treated because of peptic ulcer in Department of Gastroenterology in Katowice. Studies were performed in 112 patients. Out of these, in 73 duodenal ulcer was detected endoscopically (group I), in 26--inflammation of stomach mucous membrane with erosion (group II), and in 13--both duodenal ulcer and erosion of stomach membrane (group III). Samples from mucous membrane of pylorus and of stomach taken endoscopically were tested microscopically and in culture. Helicobacter pylori was found in 74 patients (66.1%). Frequency of isolation was different in individual groups. Helicobacter pylori was found in 51 patients (70%) of group I, 15 (58%) of group II and in 8 (61%) of group III. Helicobacter pylori was most frequently isolated from patients with duodenal and stomach ulcer (81.3%).
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