Drug E.coli P.aeruginosa S.aureus S.pyogenus   MTCC 443 MTCC 1688 MTCC 96 MTCC 442 (Microgramme/ml)         Gentamycin 0.05 1 0.25 0.5 Ampicillin 100 100 250 100 Chloramphenicol 50 50 50 50 Ciprofloxacin 25 25 50 50 Norfloxacin 10 10 10 10

Table 3: The standard drugs: Minimal bactericidal concentration.