Gravar-mail: Comparing Pulsed-Field Gel Electrophoresis with Multilocus Sequence Typing, spa Typing, Staphylococcal Cassette Chromosome mec (SCCmec) Typing, and PCR for Panton-Valentine Leukocidin, arcA, and opp3 in Methicillin-Resistant Staphylococcus aureus Isolates at a U.S. Medical Center