Panton-Valentine leukocidin
Panton-Valentine leukocidin (PVL) is a cytotoxin that causes leukocyte destruction, pneumonia and necrotizing fasciitis.
PVL is produced from the genetic material of a phage which infects Staphylococcus aureus, making it more virulent.
References
Lina G, Piémont Y, Godail-Gamot F, Bes M, Peter M, Gauduchon V, Vandenesch F, Etienne J (1999). "Involvement of
Panton-Valentine leukocidin-producing Staphylococcus aureus in primary skin infections and pneumonia.". Clin Infect
Dis 29 (5): 1128-32. PMID 10524952. Retrieved on September 1, 2006.