Prevalence and antibiotic resistance of Staphylococcus aureus and methicillin resistant S. aureus isolated from pigs

Abstract

A total of 80 nasal swabs collecting from pigs at 24 pig farms in Bac Ninh in 2019 were analyzed in this study. The studied results showed that the prevalence of pigs carrying S. aureus was 13/80 (16.25%), while the prevalence of pigs carrying MRSA was 5/80 (6.25%). The isolated S. aureus and MRSA strains were tested on antibiotic susceptibility by disk diffusion method with
12 antibiotics including penicillin G, erythromycin, linezolid, clindamycin, norfoxacin, rifampin, tetracyclin, trimethoprim – sulfamethoxazole, fusidic acid, kanamycin, Gentamycin, cefoxitin. As a result all of the tested S. aureus and MRSA isolates were susceptible with three antibiotics commonly used for human treatment, including: linezolid, rifampin, fusidic acid. However, all of
the S. aureus isolates were resistant to 4 antibiotics (penicillin G, erythromycin, clindamycin and kanamycin). Similarly, all tested MRSA isolates were not only resistant to 4 above mentioned antibiotics but also resisted to cefoxitin. In addition, the tested S. aureus and MRSA isolates were highly resistant to other antibiotics such as tetracyclin, trimethoprim – sulfamethoxazole, Gentamycin, and norfoxacin with the resistant rate was equal and higher than 60%. The research outcomes of this study indicate that the issues on monitoring/controlling antibiotics in epidemic prevention and treatment for the pig farming, as well as training to improve the knowledge on danger of the antimicrobial resistant bacteria for the farmers are very necessary so as to reduce the loss on investment and to limit environmental pollution in the pig industry. This also is a important content in the National Action Plan on preventing the antibiotic resistance phenomena signed by the Ministry of Agriculture and Rural Development in July, 2017