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The last surveys on methicillin-resistant  Staphylococcus aureus  (MRSA) isolated from bovine milk in Hungary took place in the 2000s. To elucidate the genetic variability and to estimate the burden of the pathogen, MRSA from our strain collection and prospectively collected  Staphylococcus aureus  (SA) isolates originating from two milk hygiene laboratories were investigated. Between 2003 and 2018, 27 MRSA strains originating from 10 dairy farms were deposited and characterised. Most strains ( n  = 20) belonged to ST1-t127-SCC  mec  IV and were recovered from three unrelated farms. From other farms, variable genotypes were identified sporadically: ST22-t032-SCC  mec  IV from three farms; a newly described double locus variant of ST97, ST5982-t458-SCC  mec  IV from two farms; and ST398-t011-SCC  mec  IV and ST398-t011-SCC  mec  V from two respective farms. The prospective screening of 626 individual SA isolates originating from 42 dairy farms resulted in four (0.48 %) MRSA strains from three (7.14 %) farms. All MRSA isolates belonged to the clonal complex 398 and a novel spa-type t19251 was also identified. Most isolates were resistant to three or more antimicrobial classes. The occurrence and significance of MRSA of dairy origin seems to be unchanged in the past decade in Hungary. However, the low host specificity and multiresistance of the identified genotypes calls for periodic revision on the role and distribution of the pathogen in the Hungarian dairy sector.

Occurrence and characterisation of methicillin-resistant Staphylococcus aureus isolated from bovine milk in Hungary