TABLE 1.

MRSA isolates used for resistance testing

MRSA strainAlternative nameDescriptionSource
NRS123USA400Multiply susceptible CA-MRSA carrying Panton-Valentine leukocidin genes and additional virulence genes distinct from those of HA-MRSA strainsNARSA
NRS382USA100Predominant US HA-MRSA strain, also known as the New York/Japan cloneNARSA
NRS384USA300CA-MRSA carrying Panton-Valentine leukocidin genes—now one of the most common isolates responsible for MRSA infections both in the community and, increasingly, in health care settingsNARSA
NRS387USA800Also known as the “pediatric clone,” commonly isolated from childrenNARSA