Phenotypic and Genotypic Characterization of Extended-Spectrum -Lactamase Producing Escherichia coli Isolated from Pig Feces in Farms, Muang Phayao

Narong Nuanmuang; Pareeya Baiubon; Nudchanard Wannathong; Benjamas Nunta; Niphaphorn Suriya; Parisa Chaingam; Aksarakorn Kummasook

doi:10.14456/nujst.2018.18

Authors

Narong Nuanmuang Department of Medical Technology, School of Allied Health Science, University of Phayao, 56000
Pareeya Baiubon Department of Medical Technology, School of Allied Health Sciences, University of Phayao
Nudchanard Wannathong Department of Medical Technology, School of Allied Health Sciences, University of Phayao
Benjamas Nunta Department of Medical Technology, School of Allied Health Sciences, University of Phayao
Niphaphorn Suriya Department of Medical Technology, School of Allied Health Sciences, University of Phayao
Parisa Chaingam Department of Medical Technology, School of Allied Health Sciences, University of Phayao
Aksarakorn Kummasook Department of Medical Technology, School of Allied Health Sciences, University of Phayao

DOI:

https://doi.org/10.14456/nujst.2018.18

Keywords:

Escherichia coli, ESBL, Antimicrobial Resistance, Pig Feces

Abstract

Extended-Spectrum β-Lactamase (ESBL)-producing Escherichia coli has been reported increasingly worldwide. This study aimed to investigate the prevalence, phenotypic and genotypic resistance of ESBL-producing E. coli isolated from pig feces in Muang District, Phayao Province. Pig feces were screened on MacConkey agar supplemented with (1 µg/mL) cefotaxime or ceftazidime. Suspected ESBL isolates on screening media were identified with biochemical tests. Then, suspected-ESBL-producing E. coli isolates were confirmed ESBL phenotype with combination disk method. Antimicrobial susceptibility and detection of ESBL genes were performed in a total 47 confirmed-ESBL-producing E. coli with 21 antimicrobial agents by disk diffusion and PCR methods, respectively. The results showed the prevalence of ESBL-producing E. coli, 58.8% (47/80). All 47 isolates were multidrug resistance (MDR), with resistant to AMP, CTX, CRO and CPD. However, they were still susceptible to AMC, FOX, ETP, IMP, MEM, FOS and TGC. Moreover, the phenotypic β-lactam resistance can be grouped into 6 patterns, with the predominance of AMP CTX CRO CPD ATM FEP in 48.9% (23/47). Genotypic characterization showed that all isolates possessed bla_CTX-M-9and 7 genotypic-resistant patterns have been divided. The most frequently genotypic-resistant pattern was bla_CTX-M-9(31.9%), followed by bla_{CTX-M-1 + CTX-M-9}(21.3%) and bla_{CTX-M-1 + CTX-M-9 + TEM}(19.1%). However, there was no bla_SHV gene found.High prevalence of ESBL-producing E. coli in pig farms indicated that pigs were an important reservoir of MDR. Therefore, increasing of ESBL isolates in pig farms might increase the risk of transmission ESBL from feces to the human.

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