Are you receiving Zosyn or Zyvox? If you are receiving Zosyn, did the Dr perform a susceptibility test. Zosyn is not generally effective for MRSA. By definition MRSA is methicilllin resistant Staph aureus. Copied this info from a drug reference for Zosyn "
Activity in vitro and in vivo:Aerobic and facultative gram-positive microorganisms- S. aureus (excluding methicillin- and oxacillin-resistant isolates).[SUP]1 [/SUP][SUP]2"[/SUP]
Note the excluding.