Prevalence of blaTEM and blaSHV genes in genomic and plasmid DNA of ESBL producing Escherichia coli clinical isolates from chicken

Abstract

A total of 102 chicken samples were collected from different farms in Qalubia, Behera, Cairo, Assuit and MenofiaGovernorates. The samples were represented by liver, spleen, lungs, heart blood, intestine and kidneys and subjected forisolation and identification of Escherichia coli. The bacteriological examination of the samples indicated the isolation of55 E. coli represented as 31, 6, 8, 5, and 5 from Qalubia, Behera, Cairo, Assuit and Menofia, respectively. Differentserotypes of E. coli (O158, O125, O111, O27, O20, O6, O25, O26, O145, and O159) and12 untyped strains were demonstrated.Thirty-Two E. coli isolates were subjected to initial screening test for extended-spectrum beta-lactamases (ESBLs)production by disc diffusion method with various cephalosporins. The results showed that 46.9% of samples weresensitive to ceftriaxone and cefotaxime and 53.1% to ceftazidime. By double disc synergy test, 19 E. coli strains wereidentified as ESBL producers. PCR results of 32 E. coli isolates showed that blaTEM gene was detected in the genomicDNA of all isolates and in plasmid DNA of 18 isolates. While, blaSHV was detected in the genomic DNA of 12 isolatesand in plasmid DNA of 9 isolates. We can conclude from the current results that amplification of both genomic andplasmid DNA increase the positivity of detection in comparison with amplification of each of DNAs alone