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Changes in the population structure of canine methicillin-resistant Staphylococcus pseudintermedius in Poland.

Methicillin-resistant Staphylococcus pseudintermedius (MRSP) is being reported with an increasing frequency in small animal veterinary practice. The molecular typing of MRSP isolates revealed that the dominating European multidrug-resistant lineage is the sequence type 71 (ST71), associated with staphylococcal chromosomal cassette SCCmec type II-III. However, the recent reports indicated the emergence of other clones. The study aimed to determine the genetic properties of MRSP isolates obtained from dogs in Poland over a ten-year period. A total of 42 clinical MRSP isolates were subjected to multilocus-sequence typing (MLST) and SCCmec typing. MLST typing of 42 MRSP isolates yielded six STs belonging to two major clonal complexes (CCs): CC71 and CC551, associated with SCCmec element II-III and V, respectively. CC71 comprising ST71 and its newly described single locus variant (SLV) ST680. The second dominating CC551was represented by ST551 and newly described SLV ST771. The other, ST258 and ST85 were detected in single MRSP isolates. This is the first report concerning MLST typing of MRSP isolates in Poland. The results confirmed the domination of ST71 among MRSP until 2015, and the emergence of ST551 in 2015. Furthermore, in 2016 ST551 was identified in the majority of the strains, indicating the changes in the population structure of MRSP in Poland. Polish clinical MRSP isolates showed a shift in the population structure during the period of 2007 and 2016. The dominating MRSP lineage until 2015 was multidrug-resistant ST71-SCCmecII-III. The other lineage ST551-SCCmecV emerged in Poland since 2015, and in 2016 was found in the majority of MRSP isolates.

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