n. a bacterial *exotoxin that selectively destroys white blood cells (leucocytes).
a cytotoxin responsible for increased virulence of *Staphylococcus aureus (see leukocidin). It may cause fatal necrotizing pneumonia or, more commonly, deep skin abscesses that tend to recur frequently. [Sir P. N. Panton (1877–1950) and F. C. Valentine (20th century), British pathologists]... panton–valentine leukocidin
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