Table 1.

Antimicrobial susceptibilities of all 231 non-β-lactamase-producing H. influenzae isolates compared to 85 H. influenzae strains obtained from 39 CF patients during a 2-year follow-up study

Antibiotic(s)No. (%) of non-β-lactamase-producing H. influenzaea:
Isolates (n = 231) that were:Strains (n = 85) that were:
SIRSIR
Ampicillin212 (92)11 (5)8 (3)82 (97)2 (2)1 (1)
Amoxicillin-clavulanic acid216 (94)0 (0)15 (6)84 (99)0 (0)1 (1)
Cefaclor192 (83)19 (8)20 (9)83 (98)1 (1)1 (1)
Cefuroxime217 (94)6 (3)8 (3)83 (98)1 (1)1 (1)
Cefotaxime231 (100)0 (0)0 (0)85 (100)0 (0)0 (0)
Imipenem231 (100)0 (0)0 (0)85 (100)0 (0)0 (0)
Tetracycline231 (100)0 (0)0 (0)85 (100)0 (0)0 (0)
Trimethoprim-sulfamethoxazole214 (93)0 (0)17 (7)78 (92)0 (0)7 (8)
  • a S, susceptible to the antibiotic tested; I, intermediate to the antibiotic tested; R, resistant to the antibiotic tested.