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Increased Antimicrobial Resistance of MRSA Strains Isolated from Pigs in Spain between 2009 and 2018

Department of Preventive Medicine and Public Health. Universidad de La Laguna. Campus de Ofra S/N., 38071 Santa Cruz de Tenerife, Spain
Microbiology and Infection Control Service of the University Hospital of the Canary Islands (HUC), 38004 Tenerife, Spain
Canary Islands Health Service, Santa Cruz de Tenerife, 38004 Canary Islands, Spain
Institute of Care Research, Nurses’ Association, 38001 Santa Cruz de Tenerife, Spain
Author to whom correspondence should be addressed.
Vet. Sci. 2019, 6(2), 38;
Received: 25 February 2019 / Revised: 25 March 2019 / Accepted: 2 April 2019 / Published: 4 April 2019
PDF [241 KB, uploaded 4 April 2019]


The problem of emerging resistant microorganisms such as Methicillin-Resistant Staphylococcus aureus (MRSA) associated to livestock is closely linked to improper use of antimicrobial agents. The aim of this study is to find out the prevalence and characteristics of these strains, as well as their evolution in healthy pigs on the Island of Tenerife, Spain. Between October 2009 and December 2010, 300 pigs from 15 wean-to-finishing farms were screened. Between 1 September 2017 and 31 March 2018, a new sampling was performed collecting 125 nasal swabs from pigs belonging to the same farms and under the same conditions as the previous study. MRSA antibiotic resistant patterns were studied. Results: Prevalence of MRSA isolates was 89.6%. All isolates belonged to Sequence Type 398 (ST398), a livestock related strain. All strains studied were resistant to beta-lactamic non-carbapenemic antibiotics and sensitive to teicoplanin, linezolid, vancomycin, rifampicin, quinupristin-dalfospristin, and mupirocine. Between 2009/2010–2017/2018 a significant increase in resistance to gentamicin, tobramycin, trimethoprim-sulfomethoxazole, clindamycin, Fosfomycin, and tigecycline antibiotics was observed in isolated MRSA strains compared to the previous period. We consider a major control and surveillance program of antibiotic use in veterinary care is needed in order to reduce the presence of MRSA strains in livestock and control this significant multi-resistance increase. View Full-Text
Keywords: MRSA; SCCmec; ST398; swine; antibiotic resistant MRSA; SCCmec; ST398; swine; antibiotic resistant
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Abreu, R.; Rodríguez-Álvarez, C.; Lecuona, M.; Castro, B.; González, J.C.; Aguirre-Jaime, A.; Arias, Á. Increased Antimicrobial Resistance of MRSA Strains Isolated from Pigs in Spain between 2009 and 2018. Vet. Sci. 2019, 6, 38.

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