Journal
JOURNAL OF DAIRY SCIENCE
Volume 102, Issue 1, Pages 140-144Publisher
ELSEVIER SCIENCE INC
DOI: 10.3168/jds.2018-14576
Keywords
Enterococcus faecalis; bovine mastitis; antimicrobial resistance; virulence genes
Funding
- National Key Research and Development Program of China (Lanzhou, People's Republic of China) [2017YFD0502200]
- Dairy Industry Technology and Systems Projects (Lanzhou, People's Republic of China) [CARS-36]
- Special Fund of Chinese Central Government for Basic Scientific Research Operations in Commonweal Research Institutes (Lanzhou, People's Republic of China) [1610322017013]
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This study aimed to investigate the antimicrobial resistance and virulence genes of Enterococcus faecalis isolated from subclinical bovine mastitis cases in China. Enterococcus faecalis isolates were identified by 16S rRNA amplification and sequencing. Antimicrobial susceptibility was determined by the disc diffusion method. Antimicrobial resistance and virulence genes were tested by PCR. Overall, E. faecalis was recovered from 81 of 1,787 (4.5%) mastitic milk samples. The isolates showed high resistance against tetracycline (87.7%) and erythromycin (79.0%). The most prevalent resistance genes found in the E. faecalis were tetK (96.3%), tetL (79.0%), and tetM (87.7%) for tetracycline and ermC (97.5%) for erythromycin. Moreover, gelE (70.4%), esp (85.2%), efaA (91.4%) were the most common virulence genes. This is the first report to characterize E. faecalis recovered from subclinical bovine mastitis cases in China.
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