Table 3.

Phenotypic comparisons between hemolytic and nonhemolytic GAS

StrainAssay result
Caseinase (mm)aDNase (mm)aHyaluronic acid (fg/CFU)
MGAS166s12.8 ± 1.315.1 ± 0.92
SBNH512.2 ± 1.116.3 ± 1.33.1
T18Ps016.1 ± 1.668
SB30-2017.4 ± 2.054
  • a Results are diameters of zones surrounding the inoculum after overnight anaerobic incubation of assay plates at 37°C. Measurements are means ± SD of three experiments.