TABLE 2

Antimicrobial Susceptibility to Common Empirical Antibiotic Regimens by Infection Source

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
Overall, d467418 (90)82–98.16454421 (93)87–98.35455433 (95)91–98.62
 0–6127 (58)0–10098 (89)50–10099 (100)—
 7–28117104 (89)77–100113106 (94)80–100114102 (89)79–100
 29–89338307 (91)84–100332307 (92)88–100332322 (97)93–100
By infection sourcea
 UTI alone, d
  0–89365330 (90)84–100.14357334 (94)86–100.23358344 (96)91–100.56
  0–685 (63)0–10066 (100)—66 (100)—
  7–287467 (91)75–1007169 (97)80–1007265 (90)83–100
  29–89283258 (91)84–100280259 (93)86–100280273 (98)91–100
 Bacteremia or meningitis, with or without UTI, d
  0–8910288 (86)75–100.149787 (90)79–100.229789 (92)80–100.31
  0–642 (50)0–10032 (67)0–10033 (100)—
  7–284337 (86)67–1004237 (88)67–1004237 (88)67–100
  29–895549 (89)50–1005248 (92)50–1005249 (94)50–100

  • ↵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.

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