Distribution of putative virulence genes of Avian pathogenic Escherichia coli IMT5155 in E．coli strains isolated from human and animal

Abstract:

Abstract:［Objective］We investigated the distribution of autotransporter adhesin gene B11 and other putative virulence genes of APEC IMT5155，which contributed to study the pathogenic mechanism of Avian pathogenic Escherichia coli (APEC)．［Methods］PCR and Dot blot were used to detect the distribution of putative virulence genes in E．coli strains isolated from different country (101 Chinese strains and 121 German strains)，which were from different sources (human，avian and pig)．The association of E． coli phylogenetic group and distribution of putative virulence genes was also analyzed．［Results］The putative virulence genes were most prevalent among APEC isolates，36. 4% (32/88) of APEC isolates harboring A1，53.4% (47/88) for A8，63.6% (56/88) for A10，37.5% (33/88) for B11，59.1% (52/88) for F3．The isolates positive for putative virulence genes were linked to E． coli phylogenetic group B2． Among Neonatal meningitis E．coli isolates，60%,80% and 80% were positive for putative virulence genes D1，E9 and F11，respectively． However，all the Neonatal meningitis E． coli strains were negative for B11．Conclusion］ Autotransporter adhesin gene B11 and other putative virulence genes were associated to APEC． However，putative virulence genes D1，E9 and F11 were associated to Neonatal meningitis E． coli，which indicated that APEC might be a virulence gene reservoir for Neonatal meningitis E.oli．