methicillin was the most effective antimicrobial agent against pathologic staphylococci ( 2.2 % resistance ) , followed by erythromycin ( 16.5 % resistance ) , co-trimaxozole ( 28.0 % resistance ) , chloramphenicol ( 76.9 % resistance ) , tetracycline ( 78.6 % resistance ) and penicillin and ampicillin ( 97.8 % resistance ) .
C1136254
antimicrobial agent
C0014806
erythromycin