Test of the hypothesis that triple positive Helicobacter pylori (cagA, vacA s1 and babA2 gene) has predictive value with relation to clinical presentation × Close The Infona portal uses cookies, ie strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information