TABLE 1.

MRSA isolates used for resistance testing

MRSA strain	Alternative name	Description	Source
NRS123	USA400	Multiply susceptible CA-MRSA carrying Panton-Valentine leukocidin genes and additional virulence genes distinct from those of HA-MRSA strains	NARSA
NRS382	USA100	Predominant US HA-MRSA strain, also known as the New York/Japan clone	NARSA
NRS384	USA300	CA-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 settings	NARSA
NRS387	USA800	Also known as the “pediatric clone,” commonly isolated from children	NARSA