Table 3.

Diameter of zone of growth inhibition in mm of antibacterial activity of standard drugs

Bacterial cultures	Standard antibiotic (0.5 mg/ml)
	Chloramphenicol	Ampicillin
B. subtilis	23.17 ± 0.58	07.67 ± 0.29
E. faecalis	16.67 ± 0.29	27.50 ± 0.50
E. coli	27.17 ± 0.29	19.83 ± 0.29
K. pneumoniae	18.67 ± 0.29	06.33 ± 0.29
P. aeruginosa	07.50 ± 0.50	05.17 ± 0.29
S. typhi	26.83 ± 0.29	29.83 ± 0.29
S. typhimurium	17.83 ± 0.29	06.17 ± 0.29
S. aureus	19.67 ± 0.29	10.33 ± 0.29
S. epidermidis	24.83 ± 0.76	16.83 ± 0.29
S. pyogenes	28.50 ± 0.50	44.50 ± 0.50

Antibacterial activity was expressed in terms of the diameter of zone of growth inhibition (mean ± S.D., n = 3)