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Dendrogram of selected clinical MRSA bacteremia isolates, CDC USA100 to -1100, and the first seven VRSA isolates in the United States obtained from the Network on Antimicrobial Resistance in Staphylococcus aureus showing PFGE results, location of isolation, SCCmec types, PVL toxin gene presence, and agr group. Abbreviations: N/A, not available; CDC, Centers for Disease Control and Prevention; MI, Michigan; PA, Pennsylvania; NY, New York; POS, positive; NEG, negative.
