all group a beta-hemolytic streptococcal ( gabs ) strains isolated from patients with treatment failure , both before and after benzathine penicillin g therapy , were exquisitely susceptible to penicillin g ( minimum inhibitory concentration less than or equal to 0.02 microgram/ml ) , and none showed evidence of tolerance ( minimum bactericidal concentration less than or equal to 0.04 microgram/ml ) .
C0030829
benzathine penicillin g
C0030827
penicillin g