RESUMO
To assess the variability of adhesin gene hpaA in differene H pyloristrains with PCR restriction fragment length polymorphism (RFLP) A 710 bp gene hpaA , obtained from 9 different H pylori strains, were digested by Hha Ⅰand Hae Ⅲ individually and analyzed by agarose gel electrophoresis Four different polymorphic types were found in hpaA digested with Hae III and five types with Hha I Clinical isolates of H pylori from Chongqing showed difference among them and remarkably distinguished from foreign standard strains Mongolia gerbil adapted H pylori strain,which were obtained from Mongolia gerbil infected with clinical isolate, also showed inconsistence in hpaA RFLP The hpaA gene from different H pylori strains revealed 1 variability, and this might provide an effective method for developing molecular epidemiology of H pylori