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Methicillin-resistantStaphylococcus aureus (MRSA) likely originated by acquisition of the staphylococcal cassette chromosomemec (SCCmec ) from coagulase-negative staphylococci (CNS). However, it is unknown whether the same SCCmec types are present in MRSA and CNS that reside in the same niche. Here we describe a study to determine the presence of a potentialmecA reservoir among CNS recovered from 10 pig farms. The 44 strains belonged to 10 differentStaphylococcus species. AllS. aureus strains belonged to sequence type 398 (ST398), with SCCmec types V and IVa. Type IVc, as well as types III and VI, novel subtypes of type IV, and not-typeable types, were found in CNS.S. aureus ,S. epidermidis , andS. haemolyticus shared SCCmec type V. The presence of SCCmec type IVc in several staphylococcal species isolated from one pig farm is noteworthy, suggesting exchange of this SCCmec type in CNS, but the general distribution of this SCCmec type still has to be established. In conclusion, this study shows that SCCmec types among staphylococcal species on pig farms are heterogeneous. On two farms, more than one recovered staphylococcal species harbored the same SCCmec type. We conclude that staphylococci on pig farms act as a reservoir of heterogeneous SCCmec elements. These staphylococci may act as a source for transfer of SCCmec toS. aureus .

applied and environmental microbiology

Methicillin-Resistant Coagulase-Negative Staphylococci on Pig Farms as a Reservoir of Heterogeneous Staphylococcal Cassette Chromosome <i>mec</i> Elements

Methicillin-Resistant Coagulase-Negative Staphylococci on Pig Farms as a Reservoir of Heterogeneous Staphylococcal Cassette Chromosome mec Elements