Table 1.

The effect of a variety of antibiotics on bacterial growth at three different phases of Escherichia coli and Staphylococcus aureus

Growth phases	Type of antibiotic	Zone of inhibition/mm
		E. coli	S. aureus
Early log phase	Ampicillin 10 μg	6	6
	Polymexin 300 μg	10	6
	Tetracycline 30 μg	20	6
	Ciprofloxacin 5 μg	31	28
Mid log phase	Ampicillin 10 μg	6	6
	Polymexin 300 μg	14	6
	Tetracycline 30 μg	17	6
	Ciprofloxacin 5 μg	34	31
Late log phase	Ampicillin 10 μg	6	6
	Polymexin 300 μg	6	6
	Tetracycline 30 μg	6	6
	Ciprofloxacin 5 μg	6	6