The antibiotic MIC for 114 species of clinically isolated GAS and antibacterial activities of 10 kinds of antibiotics were determined by means of a standard agar dilution method.The results were that MIC for penicillin, oxacillin, ampicillin, amoxicillinum ranged within 0. 00625~0. 4mg/L; penicillin is the best among those MIC50 within 0. 0125~0. 05 mg/L; GAS is more sensitive to cephalosporins, MIC of which group ranged within 0. 003125~0. 8mg/L;while cefataxin sodium is of obvious effect among those MIC5O...