[Particular features of the relationship of Helicobacter pylori and G cells in patients with duodenal ulcer, with special reference to the Helicobacter pylori strain].

Helicobacter pylori positive form of duodenal ulcer (CagA+ and CagA-) was studied in 120 patients with duodenal ulcer (DU). CagA+ was found in 78 patients (65%); CagA(-)--in 42 (35%). Diagnostic criteria of symbiosis between Helicobacter pylori and macroorganisms have been established.