Table 2.

Comparison of extracellular and intracellular hemolytic titers of representative isolates examined in this study

StrainStrain IDHemolytic titera:
CytoplasmicExtracellular
S. pneumoniae
 TypicalPC1972930
D398130
D39Δply
 AtypicalCol272730
S. mitisgroup
 TypicalNS51T
M3
 AtypicalCol1524310
Col1772930
Col2072930
7642710
S. oralis groupNCTC 11427T
Col21
Col25
  • a Hemolytic titer is expressed as the reciprocal of the lowest dilution at which complete lysis of horse blood was seen. Extracellular titers were multiplied by 10 such that they represent a cell number comparable to that used to obtain cytoplasmic titers. –, No hemolytic activity detected.