S. pseudintermedius is usually part of the normal microbiota on the skin and outer mucous membranes of dogs and, at the same time, a major opportunistic pathogen. Strains containing the mecA gene are called methicillin-resistant S. pseudintermedius (MRSP). Such strains have already been found in humans, which means that zoonotic significance is also possible. MRSP strains are often resistant to several classes of antimicrobial drugs. In our work, the most extensive resistotype of MRSP isolates showed resistance to as many as 10 groups of antibiotics. A large number of different resistotypes appeared in methicillin sensitive S. pseudintermedius (MSSP). However, these resistotypes were less extensive, and just under a third of MSSP isolates were not resistant to any of the antibiotics tested. The most extensive resistotype of MSSP isolates included 8 groups of antibiotics. Most of the isolates in our work belonged to the sequence type ST71, which is also the most frequently identified sequence type of MRSP in Europe. The second most represented sequence type in Slovenia was ST551. Both of the most represented sequence types were present in different regions of Slovenia, which indicates that they are widespread throughout the country.
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