BACKGROUND AND AIM: In developed countries, reinfection of Helicobacter pylori (H. pylori) after eradication of the bacterium is unusual, while the reinfection rate in developing countries is variable. In this study, we determined the reinfection rate after successful H. pylori eradication in Japan, a country with a high prevalence of H. pylori infection. METHODS: After successful eradication, 377 patients were followed up by endoscopy and urea breath test annually. In reinfected patients, H. pylori strains isolated initially and after reinfection were compared by using random amplification of polymorphic DNA fingerprinting. RESULTS: H. pylori became positive in four of 337 patients (1.2) 1 year after eradication and in two of 133 patients (1.5) 2 years after eradication. One patient experienced an ulcer relapse 2 years after eradication therapy. Random amplification of polymorphic DNA fingerprinting of the isolated strains from four of the six patients showed two had identical strains (at 1 year) while the other two had different strains (one at 1 year and one at 2 years). When infection in the two patients reinfected with identical strains is considered a recrudescence, the true reinfection rate is < 0.8 per patient year. CONCLUSIONS: The reinfection rate after eradication of H. pylori is low in Japan despite the country's high prevalence of H. pylori infection.
BACKGROUND AND AIM: In developed countries, reinfection of Helicobacter pylori (H. pylori) after eradication of the bacterium is unusual, while the reinfection rate in developing countries is variable. In this study, we determined the reinfection rate after successful H. pylori eradication in Japan, a country with a high prevalence of H. pyloriinfection. METHODS: After successful eradication, 377 patients were followed up by endoscopy and urea breath test annually. In reinfected patients, H. pylori strains isolated initially and after reinfection were compared by using random amplification of polymorphic DNA fingerprinting. RESULTS:H. pylori became positive in four of 337 patients (1.2) 1 year after eradication and in two of 133 patients (1.5) 2 years after eradication. One patient experienced an ulcer relapse 2 years after eradication therapy. Random amplification of polymorphic DNA fingerprinting of the isolated strains from four of the six patients showed two had identical strains (at 1 year) while the other two had different strains (one at 1 year and one at 2 years). When infection in the two patients reinfected with identical strains is considered a recrudescence, the true reinfection rate is < 0.8 per patient year. CONCLUSIONS: The reinfection rate after eradication of H. pylori is low in Japan despite the country's high prevalence of H. pyloriinfection.
Authors: Kum Hei Ryu; Sun Young Yi; Youn Ju Na; Su Jung Baik; Su Jin Yoon; Hae-Sun Jung; Hyun Joo Song Journal: World J Gastroenterol Date: 2010-01-14 Impact factor: 5.742
Authors: M G Bruce; D L Bruden; J M Morris; A L Reasonover; F Sacco; D Hurlburt; T W Hennessy; J Gove; A Parkinson; G Sahagun; P Davis; J Klejka; B J McMahon Journal: Epidemiol Infect Date: 2014-07-28 Impact factor: 4.434
Authors: Stefano Kayali; Marco Manfredi; Federica Gaiani; Laura Bianchi; Barbara Bizzarri; Gioacchino Leandro; Francesco Di Mario; Gian Luigi De' Angelis Journal: Acta Biomed Date: 2018-12-17