Deletion of cagM, cagT, orf10, and orf13 was found in 2 (2.0%) isolates (1 isolate from patient with gastric carcinoma and 1 isolate with gastric ulcer), and cagE deletion was found in 4 (4.0%) isolates (each isolated from patient with gastric carcinoma, gastric ulcer, duodenal ulcer, or chronic gastritis, resp). This evidence concerns the gene DDX53 and duodenal ulcer.