Characteristics of patients with healthcare-associated (HCAP), hospital-acquired (HAP), and community-acquired (CAP) methicillin-resistant Staphylococcus aureus (MRSA) pneumonia.

aAppropriate empiric antimicrobial therapy, treatment with vancomycin, linezolid, or clindamycin if the MRSA isolate was susceptible, in the 24-48 hrs prior to the availability of culture results.bVancomycin trough levels, among those treated with vancomycin and for whom vancomycin levels were available.cPFGE, pulsed-field gel electrophoresis (145 isolates available for molecular typing).dVancomycin MIC, minimal inhibitory concentration (µg/mL) as determined by Etest (145 isolates available for susceptibility testing).