Detection of virulence genes and analysis of antimicrobial resistance of E. coli from calves with diarrhea in Tongliao City, Inner Mongolia Autonomous Region, China
- VernacularTitle:内蒙古通辽地区犊牛腹泻大肠埃希菌毒力基因检测及耐药性分析
- Author:
Si‑qin YANG
1
;
Ping WANG
1
;
Hasi CHAGAN
1
;
Shun‑li SHI
1
Author Information
1. College of Animal Science and Technology，Inner Mongolia Minzu University，Tongliao 028000，Inner Mongolia Autonomous Region，China
- Publication Type:Journal Article
- Keywords:
Calf；E. coli；Virulence gene；Antimicrobial resistance
- From:
Chinese Journal of Biologicals
2023;36(2):151-157
- CountryChina
- Language:Chinese
-
Abstract:
Objective To detect the virulence gene of E. coli from calves with diarrhea in Tongliao City，Inner Mongolia Autonomous Region，China and analyze its antimicrobial resistance as well as the distribution of antimicrobial resistant genes. Methods The sensitivities of 82 E. coli isolates from the fecal samples of calves with diarrhea to thirteen kinds of antibiotics were determined by disk diffusion test. The carrying statuses of thirteen virulence genes and twelve antimicrobial resistant genes of the E. coli isolates were determined by PCR，based on which the phylogenetic background was investigated. Results Of the 82 pathogenic E. coli isolates，48. 78%（40／82）、31. 71%（26／82）、14. 63%（12／82）and 4. 88%（4／82）belonged to phylogenic groups A，B1，B2 and D respectively，indicating that the prominent one was group A. A total of 11 virulence genes were detected in 82 isolates. The detection rates of irp2，fyuA，eaeA and STb genes were 79. 27%（65／82），63. 41%（52／82），53. 66%（44／82）and 50%（41／82）respectively，while those of other virulence genes were less than 50%，and no tsh or LT1 was detected. The 82 isolates were significantly resistant to 13 kinds of antibiotics，in which the resistant rates to tetracycline，doxycycline and amoxicillin were 100%（82／82），97. 56%（80／82）and 90. 24%（74／82）respectively. All the isolates were mutidrug resistant，most of which were resistant to eight kinds of antibiotics（16／82，19. 51%）. A total of twelve antimicrobial resistant genes were detected in the 82 isolates，in which the positive rates of genes resistant to β ‑ lactams（blaTEM），sulfonamide（sul1 and sul2），tetracycline（tetB and tetD）and aminoglycosides（aadB）were more than 70%. Conclusion The 82 pathogenic E. coli isolates mainly belonged to group A，with high detection rates of virulence gene and antimicrobial resistant gene as well as high and multiple drug resistance. The study provided a reference for the prevention and treatment of and clinical medication of E. coli‑associated diseases in calves in Tongliao Region.
- Full text:内蒙古通辽地区犊牛腹泻大肠埃希菌毒力.pdf
