Animal Husbandry and Feed Science ›› 2022, Vol. 43 ›› Issue (1): 124-128.doi: 10.12160/j.issn.1672-5190.2022.01.021

• Animal Disease Prevention and Control • Previous Articles    

Isolation,Identification and Antimicrobial Sensitivity Test of Staphylococcus aureus from Dairy Cow Mastitis

JIA Zi-bo, PENG Jian-kang, ZHU Yan, CHEN Hai-feng, WANG Jing   

  1. Jiangsu Agri-animal Husbandry Vocational College,Taizhou 225300,China
  • Received:2021-11-15 Online:2022-01-30 Published:2022-02-10

Abstract: [Objective] To investigate the prevalence of Staphylococcus aureus associated with mastitis and its sensitivity to the commonly used antibiotics in a dairy farm in Taizhou City. [Method] Nine milk samples were recovered from the dairy cows with mastitis. The bacterial strains were isolated with Baird-Parker agar medium, and the obtained isolates were subjected to phenotypic indentification by biochemical reactions as well as molecular comfirmation by PCR assay. Furthermore, the antimicrobial sensitivity test of the isolates were carried out. [Result] Six Staphylococcus strains were obtained and identified using the coagulase test and 16S rDNA sequencing, three of which were comfirmed as Staphylococcus aureus. According to antimicrobial sensitivity test, all three strains of Staphylococcus aureus were resistant to penicillin G, two strains were resistant to tetracycline, and two strains were intermidiate to erythromycin and oxacillin. [Conclusion] The Staphylococcus aureus isolates were mostly resistant to penicillin G and tetracycline, but susceptible to the other tested antibiotics.

Key words: dairy cow mastitis, Staphylococcus aureus, isolation and identification, antimicrobial sensitivity test

CLC Number: