Table 4. Phenotypic homogeneity among organisms within single colonies from oropharyngeal swabs taken from pediatric patients with pharyngitis.

GAS strain	emm subtype	No. of CFUs following colony filtration (x 103)	No. of CFUs screened	Predominant SpeB phenotype	% of CFUs expressing the predominant SpeB phenotype
CMH100	6.4	27.4	499	producer	100
CMH103	12.0	60.0	50	producer	100
CMH109	87.0	6.2	940	producer	100
CMH113	3.91	3.9	50	non-producer	100
CMH119	2.0	1.2	50	producer	100
CMH120	5.14	13.9	50	producer	100
CMH125	1.0	13.3	49	producer	100
CMH135	1.0	6.8	50	non-producer	100

CFU, colony forming unit