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Cytotoxic activity, by major clonal complex (CC; A) and agr functionality (B). CCs are considered major if there are ≥10 strains with the same CC. Cell viability of PMN-HL60 cells with 20 µL of supernatant for 2 hours, measured with the metabolic dye CellTiter. δ-hemolysin semiquantitative scoring on sheep blood agar: 0, nonhemoltyic; 1, weakly hemolytic; 2, strongly hemolytic. Q, quartile range of cytotoxicity, from the upper quartile (Q1) to the lower quartile (Q4).
