Characteristics of cagA, vacA virulence factors of Helicobacter pylori and CYP2C19 Enzyme polymorphism in patients with H.pylori - induced peptic ulcer disease who have not been treated. pntmj [Internet]. 2026 Oct. 20 [cited 2026 Nov. 1];3(4). Available from: https://bsgdtphcm.vn/ojs/index.php/pnt/article/view/408