Abstract
To investigate the presence and the genetic environment of the multiresistance gene cfr in Jeotgalicoccus pinnipedialis and Macrococcus caseolyticus from pigs. A total of 391 bacterial isolates with florfenicol MICs ≥16 mg/L were obtained from nasal swabs of 557 individual pigs; of these, 75 Gram-positive isolates other than staphylococci and enterococci were screened by PCR for the presence of known florfenicol resistance genes. Species assignments of the cfr-carrying isolates were based on the results of biochemical profiling and 16S rDNA sequencing. The locations of the cfr gene were determined by Southern blotting. Regions flanking each cfr gene were sequenced by a modified random primer walking strategy, and the transferability of cfr was assessed by electrotransformation. Two M. caseolyticus isolates and one J. pinnipedialis isolate were cfr positive. The cfr gene was located either on a 7057 bp plasmid, pSS-03, which was widely distributed among staphylococci of pig origin, or on the ∼53 kb plasmid pJP1. The region of pJP1 that included the cfr gene and the adjacent IS21-558, showed 99.7% identity to the corresponding region of plasmid pSCFS3. In addition, the genes aadD + aacA-aphD, ble and erm(C), coding for aminoglyco...Continue Reading
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