AF.25 FALSE NEGATIVITY OF RAPID UREASE TEST FOR HELICOBACTER PYLORI DIAGNOSIS: COMPARISON WITH OTHER DIAGNOSTIC TESTS. (September 2021) - Losurdo, G.; Francioso, F.; Pricci, M.; Girardi, B.; Russo, F.; Riezzo, G.; Martulli, M.; Pisani, A.; Ierardi, E.; Di Leo, A.