PCR Detection of Pilus-associated Genes and Serotype Identification of Pathogenic Escherichia coli Isolated from Chickens in the Jidong Area

[ Objective] This study aimed to explore the presence of type I pill （fimC gene） and P pill （papC gene） and identify the serotype of pathogenic E. coli isolated from chickens in the Jidong Area. [ Method] Type I pill （fimC gene） and P pill （papC gene） were detected by PCR. The serotype was identified by con- ventional agglutination test. [ Result ] The results showed that 100% of chicken-derived E. coil strains expressed type I pill （fimC gene） ; 39.1% （9/23） of chick- en-derived E. coli strains expressed P pill （papC gene）. In addition, 23 isolates of chicken-derived E. coil were assigned to 14 O serotypes, including O78, O93, O 45, O101, O38, O88, O24, O1, O163, O53, O15, O87, O34 and O29, among which O78 was the dominant serotype that accounted for 42.8% （6/14） of the total strain number. [ Conclusion] Chicken-derived E. coli strains in the Jidong Area belonged to 14 serotypes, and 078 was the dominant serotype; 83.3% of 078 serotvDe E. coli strains expressed both tvDe I Dill and P Dill.