TABLE 4.

Antibiotic disk sensitivity results for three S. pyogenes strains

S. pyogenes strain and medium	Zone diam (mm)
	Penicillin	Erythromycin	Chloramphenicol	Vancomycin
ATCC 19615
CSB MHA	38-42	35-36	28	22-23
DSB MHA	32-33	25-27	26-27	22-23
Hu MHA	35-37	24-25	27-28	23-24
JC 20
CSB MHA	33-34	27-29	22-23	20-21
DSB MHA	30-31	24-25	22-23	18-19
Hu MHA	35-36	24-25	22-24	20-22
Clinical isolate
CSB MHA	38-39	28-29	27-28	21-22
DSB MHA	38-40	28	28-29	19-20
Hu MHA	31-34	22-25	27-28	18-21