of the 100 methicillin-susceptible isolates of staphylococcus aureus tested , 77 % were susceptible to 1 mg/l azithromycin and 0.5 mg/l erythromycin , whereas 22 % were resistant to 32 mg/l of both compounds .
C0052796
azithromycin
C0014806
erythromycin