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Background and Objectives:Helicobacter pylori infection is strongly associated with chronic gastritis and ulcer disease and mucosa-asociated lymphoid tissue (MALT) and represent an extragastric reservoir for H. pylori infection. This study was designed to find out the settling frequency of H. pylori in tonsil and adenoid tissues by Compylobacter like organism (CLO) test on tonsilectomy and adenoidectomy specimens in Koreans. Materials and Method:We reviewed the records of 52 patients aged 3 to 51 who had undergone an adenoidectomy, tonsillectomy, or adenotonsillectomy procedure under local or general CLO test kit. Color changes were noted after 20 minutes and after periods of 1, 3, and 24 hours. Results:Thirty three (63.5%) of the 52 patients were shown to be H. pylori positive. H. pylori positive rate was not significantly different acording to operation methods, age and sex. H. pylori positive rate in tonsil specimens (62.7%) was significantly higher than that in adenoid specimens (17.6%)(p<0.05). Conclusion: H. pylori infection. Tonsillectomy may be associated with decreased prevalence of H. pylori colonization. Further study is needed about corelation betwen H. pylori colonization in tonsil and H. pylori associated gastric disease. (Korean J Otolaryngol 2003 ;46 :846-50)