molecular typing of the pathogenic yersinia enterocolitica strains with pulsed field gel electrophores isolated in china objective to investigate the epidemiological and molecular typing features of the pathogenic yersinia enterocolitica strains isolated in chinausing pulsed field gel electrophoresispfge and standardized pfge method as well as typing database of yersinia enterocoliticamethods pfge analysis was performed as laboratory directions for molecular subtyping of salmonella by pfge pulsenetusa with some modifications and the results of pfge were analyzed by bionumerics soft version 40 applied maths bvba beliumresults 114 o3 yersinia enterocolitica strains were typed by 25 patterns to have found that k6gn11c30012 50 strains k6gn11c3001519 strains and k6gn11c3001610 strains were the major patterns k6gnllc30012 had 922 cluster similarity with k6gn11c30009k6gn11c30023 this clone included 9123 strains of 114 03 yersinia enterocolitica strains 51 09 yersinia enterocolitica strains were typed by 14 patterns k6gn11c90004 22 strains and k6gn11c90010 13 strainswere the major patterns k6gn11c90004 had 818 cluster similarity with k6gn11c90010 patterns the major patterns of 03 and 09 serotypes were quite differentconclusion o3 yersinia enterocolitica strains might originate from the same clone and had very few variation in different years and provinces but o9 yersinia enterocolitica strains from two different clones with some changes