TABLE 3

Antimicrobial Susceptibility to Common Empirical Antibiotic Regimens by Pathogen

Third-Generation CephalosporinThird-Generation Cephalosporin + AmpicillinaGentamicin + Ampicillinb
All Patients Susceptible IsolatesBy HospitalAll Patients Susceptible IsolatesBy HospitalAll Patients Susceptible IsolatesBy Hospital
Ncn (%)Minimum–Maximum, %PbNcn (%)Minimum–Maximum, %PbNcn (%)Minimum–Maximum, %Pb
Pathogena
E coli352338 (96)90–100.03352338 (96)90–100.03352339 (96)90–100.44
 GBS5151 (100)3838 (100)3838 (100)
Klebsiella spp1817 (94)50–1001817 (94)50–1001818 (100)
 SCEd188 (44)0–67188 (44)0–671818 (100)
Enterococcus160 (0)1616 (100)1616 (100)
S aureus80 (0)80 (0)80 (0)
S pneumoniae33 (100)33 (100)33 (100)
  • a Each pathogen counted only once per patient if >1 infection source.

  • b P value from Pearson’s χ2 test of susceptibility × hospital for age <90 d.

  • c Total number of cases with nonmissing data varies by empirical regimen.

  • d Gram-negative bacteria with inducible β-lactamase genes Serratia, Citrobacter, and Enterobacter.

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