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Hemolytic activity of S. aureus on sheep blood. RN4220, a strong beta-hemolysin producer, is streaked vertically, and at right wt (freeze stock), C1 and C2 (two controls passed on TSA without triclosan). At right from top and down A1-A7 (7 triclosan adapted strains). Beta-hemolysin forms a tubid zone of hemolysis surrounding the vertical streak of RN4220. Delta-hemolysis and beta-hemolysis are synergistic, producing a clear hemolysis where they intersect.
