Introduction
Panton–Valentine leukocidin (PVL) is a pore-forming cytotoxin produced by Staphylococcus aureus inducing leukocyte destruction and tissue necrosis.1Although produced by <5% of S. aureus strains, the toxin is detected in large percentages of isolates that cause necrotic skin lesions2–8 and severe necrotizing pneumonia.2,4Although commonly associated with community-acquired methicillin-resistant S. aureus (CA-MRSA),9several outbreaks caused by methicillin-susceptible strains have also been reported.