Population Structure and Oxacillin Resistance ofStaphylococcus aureusfrom Pigs and Pork Meat in South-West of Poland

Abstract

The genotypes and oxacillin resistance of 420S. aureusisolates from pigs (n=203) and pork (n=217) were analyzed. Among 18spatypes detected inS. aureusfrom pig t011, t021, t034, t091, t318, t337, and t1334 were the most frequent. Among 30spatypes found inS. aureusisolates from pork t084, t091, t499, t4309, t12954, and t13074 were dominant. The animalS. aureusisolates were clustered into MLST clonal complexes CC7, CC9, CC15, CC30, and CC398 and meat-derived isolates to CC1, CC7, and CC15. Thirty-six MRSA were isolated exclusively from pigs. All MRSA were classified tospat011 SCCmecV. BORSA phenotype was found in 14%S. aureusisolates from pigs and 10% isolates from pork meat.spat034 dominated among BORSA from pigs and t091 among meat-derived BORSA. This is the first report onspatypes and oxacillin resistance ofS. aureusstrains from pigs and pork meat in Poland. BesidesS. aureusCC9, CC30, and CC398 known to be distributed in pigs, the occurrence of genotype belonging to CC7 in this species has been reported for the first time. To our knowledge it is also the first report concerning CC398 BORSA isolates from pigs and pork meat.