TABLE 3.

Antimicrobial Susceptibility to Common Empirical Antibiotic Regimens by Pathogen

	Third-Generation Cephalosporin				Third-Generation Cephalosporin + Ampicillina				Gentamicin + Ampicillinb
	All Patients Susceptible Isolates		By Hospital		All Patients Susceptible Isolates		By Hospital		All Patients Susceptible Isolates		By Hospital
	Nc	n (%)	Minimum–Maximum, %	Pb	Nc	n (%)	Minimum–Maximum, %	Pb	Nc	n (%)	Minimum–Maximum, %	Pb
Pathogena
E coli	352	338 (96)	90–100	.03	352	338 (96)	90–100	.03	352	339 (96)	90–100	.44
GBS	51	51 (100)	—		38	38 (100)	—		38	38 (100)	—
Klebsiella spp	18	17 (94)	50–100		18	17 (94)	50–100		18	18 (100)	—
SCEd	18	8 (44)	0–67		18	8 (44)	0–67		18	18 (100)	—
Enterococcus	16	0 (0)	—		16	16 (100)	—		16	16 (100)	—
S aureus	8	0 (0)	—		8	0 (0)	—		8	0 (0)	—
S pneumoniae	3	3 (100)	—		3	3 (100)	—		3	3 (100)	—

^aEach pathogen counted only once per patient if >1 infection source.

^bP value from Pearson’s χ² test of susceptibility × hospital for age <90 d.

^cTotal number of cases with nonmissing data varies by empirical regimen.

^dGram-negative bacteria with inducible β-lactamase genes Serratia, Citrobacter, and Enterobacter.

—, no range given as all sites have equal percentages.