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Livestock-associated methicillin-resistant Staphylococcus aureus (LA-MRSA) was detected in 2003 and rapidly became the predominant MRSA clade in the Netherlands. Studies have shown that transmissions are difficult to identify, since this MRSA variant represents a genetically homogenous clade when current typing techniques are used. Here, next-generation sequencing was performed on 206 LA-MRSA isolates to assess the capability of LA-MRSA to be transmitted between humans. The usefulness of single nucleotide variants (SNVs), the composition of the SCCmec region, and the presence of plasmids to identify transmission of LA-MRSA were assessed. In total, 30 presumed putative nosocomial transmission events and 2 LA-MRSA outbreaks were studied; in most cases, SNV analysis revealed that the isolates of the index patient and the contact(s) clustered closely together. In three presumed events, the isolates did not cluster together, indicating that transmission was unlikely. The composition of the SCCmec region corroborated these findings. However, plasmid identification did not support our SNV analysis, since different plasmids were present in several cases where SNV and SCCmec analysis suggested that transmission was likely. Next-generation sequencing shows that transmission of LA-MRSA does occur in Dutch health care settings. Transmission was identified based on SNV analysis combined with epidemiological data and in the context of epidemiologically related and unrelated isolates. Analysis of the SCCmec region provided limited, albeit useful, information to corroborate conclusions on transmissions, but plasmid identification did not.

applied and environmental microbiology

Next-Generation Sequencing Confirms Presumed Nosocomial Transmission of Livestock-Associated Methicillin-Resistant Staphylococcus aureus in the Netherlands