Occurrence and characterization of livestock-associated methicillin-resistant Staphylococcus aureus in pig industries of northern Thailand

다국어 초록 (Multilingual Abstract)

This study was conducted to determine the prevalence oflivestock-associated methicillin-resistant Staphylococcus aureus(LA-MRSA) in pigs, farm workers, and the environment innorthern Thailand, and to assess LA-MRSA isolatephenotypic characteristics. One hundred and four pig farmswere randomly selected from the 21,152 in Chiang Mai andLamphun provinces in 2012. Nasal and skin swab sampleswere collected from pigs and farm workers. Environmentalswabs (pig stable floor, faucet, and feeder) were also collected.
MRSA was identified by conventional bacterial culturetechnique, with results confirmed by multiplex PCR and multilocus sequence typing (MLST). Herd prevalence of MRSA was9.61% (10 of 104 farms). Among pigs, workers, and farmenvironments, prevalence was 0.68% (two of 292 samples),2.53% (seven of 276 samples), and 1.28% (four of 312 samples),respectively. Thirteen MRSA isolates (seven from workers,four from environmental samples, and two from pigs) wereidentified as Staphylococcal chromosomal cassette mec IVsequences type 9. Antimicrobial sensitivity tests found 100% ofthe MRSA isolates resistant to clindamycin, oxytetracycline, andtetracycline, while 100% were susceptible to cloxacillin andvancomycin. All possessed a multidrug- resistant phenotype.
This is the first evidence of an LA-MRSA interrelationship among pigs, workers, and the farm environment in Thailand.

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