Antibiotic resistance and screening of the resistant genes of Escherichia coli (E. coli) isolated from diarrheal yak calves in Sichuan Province, China

摘要

This study was conducted to determine the antibiotic and screening resistancegenes of Escherichia coli (E. coli) isolated from diarrheal yak calves from high remoteplateau in Sichuan, China. A total 41 rectal swabs were obtained from diarrheal yak calves.E. coli were isolated and identified. The antimicrobial sensitivity was tested by piloting thedisk diffusion method for 21 antibiotics. Polymerase chain reaction was employed to detectthe resistance genes. The results showed that the drug resistance ranged from 2.4% (amikacin)to 53.7% (tetracycline), while no isolates were found resistant to neomycin and polymyxin B.Multi-drug resistance was detected in 4.9% isolates to 17 antimicrobial agents; and 24.4%isolates were found susceptible to all antimicrobial agents. The aminoglycoside resistancegenes of aac(3)-lla, ant(3')-la and aph(3')-lla was positive in 4.9%, 2.1% and 7.3% E. coliisolates respectively. The 4.9% and 2.1% of E. coli isolates were detected in b-Lactam resistancegenes of TEM and CTX-M, respectively; and 12.2% and 4.9% of E. coli isolates were found tohave Tetracycline resistance genes of tetM and tetA, respectively. The present study revealsthat the yak calves from high cold plateau are potential reservoir of E. coli with widelydistributed multiple drug resistance which requires the attention of concerned authoritiesregarding the use of non-standard antibiotics.