Table 1.

Number of dead mice 72 h after antibiotic treatment and derived ED₅₀ estimates

Antibiotic	No. of mice dead after receiving a dose (mg/kg)a of:								ED50 (mg/kg)
	0.1	1	10	20	40	60	80	100
Ertapenem	6	6	6	6	5	6	4	3	100
Imipenem-cilastatin	6	6	6	6	5	5	5	4	>100
Ceftazidime	6	5	5	1	1	0	1	0	24
Cefotaxime	6	6	6	6	5	5	6	5	>100
Piperacillin-tazobactam	6	6	6	6	6	6	6	6	>100

^aThere were six mice per dose group.