Antibiotic Resistance Profiles and Molecular Mechanisms of From Chicken and Pig in China

Overview

Journal Front Microbiol

Specialty Microbiology

Date 2020 Nov 16

PMID 33193261

Citations 24

Authors

Mengjun Tang

Qian Zhou

Xiaoyan Zhang

Sheng Zhou

Jing Zhang

Xiujun Tang

Junxian Lu

Yushi Gao

Affiliations

Soon will be listed here.

Abstract

The purpose of this research was to characterize the antibiotic resistance profiles of spp. derived from chicken and pig feces collected from farms in Jiangsu Province, China, and to analyze the relevant resistance mechanisms among antimicrobial-resistant spp. isolates. Antibiotic susceptibility to nine antibiotic agents was tested with the microdilution method in 93 spp. (45 and 25 from chickens; 23 from pigs). High rates of resistance were observed to nalidixic acid (79.6%), erythromycin (75.3%), tetracycline (68.8%), azithromycin (66.7%), ciprofloxacin (64.5%), and gentamicin (35.5%), with a lower resistance rate to florfenicol (8.6%). The prevalence of the tested antibiotic resistance in was higher than in from chickens. The rate of antimicrobial resistance to ciprofloxacin in isolates from chickens was 100.0%, and the isolates from pigs were all resistant to erythromycin (100%). Most of (64.4%) and (64.5%) isolates displayed multi-drug resistance. All the spp. isolates resistant to fluoroquinolones had the C257T mutation in the A gene. All 64 tetracycline-resistant spp. isolates were positive for the O gene. The A gene was also amplified in 6.5% of spp. isolates, whereas B was not detected among the isolates. The A2075G point mutation in the 23S rRNA gene occurred in 86.1% (62/72) of the macrolides-resistant spp. isolates, and the B gene was identified in 49 spp. isolates (30 and 19 ). Amino acid insertions or mutations in the L4 and L22 ribosomal proteins were not linked to macrolide resistance. These results highlight the high prevalence of resistance to multiple antibiotics, particular macrolides, among spp. from chickens and pigs in Jiangsu Province, China, which is probably attributable to the overuse of antimicrobials in chicken and pig production. These findings recommend the more cautious use of critical antimicrobial agents in swine and poultry production. Stringent and continuous surveillance is required to reduce the drug-resistant campylobacteriosis in food animals and humans.

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