TABLE 4.

Comparative activity of piperacillin-tazobactam and other parenterally administered antibiotics against aerobic Gram-negative bacilli isolated in community and teaching hospitals

Organism	Percentage of strains susceptible to
	Piperacillin-tazobactam			Piperacillin			Ticarcillin-clavulanate
	Community	Teaching	P*	Community	Teaching	P	Community	Teaching	P
Escherichia coli	99	97	0.071	77	72	0.13	95	90	0.0034
Klebsiella species	97	95	0.25	88	81	0.013	97	95	0.25
Enterobacter species	87	88	0.89	84	85	0.71	77	81	0.27
Proteus-Providentia group	100	99	0.56	91	97	0.020	100	96	0.020
Pseudomonas aeruginosa	98	95	0.0033	98	94	0.0023	91	86	0.0093

^*Fishers Exact Test