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Table 4 Susceptibility of gram-negative bacterial species to selected antimicrobial agents

From: Aerobic bacteria associated with chronic suppurative otitis media in Angola

Antimicrobial agent Susceptibility1 Proteus spp. (N = 89)2 non-Proteus Enterobacteriaceae (N = 131)3 P. aeruginosa (N = 63)4 H. influenzae (N = 5) M. catarrhalis (N = 9)
   N (%) N (%) N (%) N (%) N (%)
Amoxicillin S        4 (80)   
  R        1 (20)   
Piperacillin-tazobactam S 88 (98.9) 125 (95.4) 61 (96.8)     
I    5 (3.8)       
  R 1 (1.1) 1 (0.8) 2 (3.2)     
Cefotaxime S 88 (98.9) 121 (92.3)    5 (100) 9 (100)
  I    1 (0.8)       
  R 1 (1.1) 9 (6.9)       
Ceftazidime S 88 (1.1) 122 (93.1) 62 (98.4)     
  I    2 (1.5)       
  R 1 (1.1) 7 (5.3) 1 (1.6)     
Imipenem S 89 (100) 122 (93.1) 60 (95.2)     
  I    9 (6.9) 3 (4.8)     
Meropenem S 89 (100) 131 (100) 52 (82.5) 5 (100) 9 (100)
  I      11 (17.5)     
Ciprofloxacin S 76 (85.4) 105 (80.2) 58 (92.1) 5 (100) 9 (100)
  I 3 (3.4) 7 (5.3) 1 (1.6)     
  R 10 (11.2) 19 (14.5) 4 (6.3)     
Gentamicin S 63 (70.8) 106 (80.9) 58 (92.1)     
  I 3 (3.4) 3 (2.3) 1 (1.6)     
  R 23 (25.8) 22 (16.8) 4 (6.3)     
Tobramycin S 72 (80.9) 109 (83.2) 59 (93.7)     
  I 5 (5.6) 13 (9.9)       
  R 12 (13.5) 9 (6.9) 4 (6.3)     
Tetracycline S        4 (80) 7 (77.8)
  R        1 (20) 2 (22.2)
Trimethoprim-sulfamethoxazole S 31 (34.8) 71 (54.2)    2 (40) 1 (11.1)
I 2 (2.2) 2 (1.5)      1 (11.1)
  R 56 (62.9) 58 (44.3)    3 (60) 7 (77.8)
Chloramphenicol S    27 (57.4)       
  R    20 (42.6) 42 (100)     
Colistin S    263 (55.3) 404 (95.2)     
  R 702 (100) 213,5 (44.7) 24,6 (4.8)     
  1. Isolates grouped as non-Proteus Enterobacteriaceae were 38 Providencia spp., 25 Morganella morganii, 18 Klebsiella spp., 18 Citrobacter spp., 13 Enterobacter spp., 13 Escherichia spp., 3 Pantoea agglomerans, 2 Serratia marcescens and 1 Raoultella ornithinolytica
  2. 1 S, susceptible; I, intermediate; R, resistant
  3. 2 Susceptibility testing for Proteus spp. against colistin was done with 70 randomly selected isolates
  4. 3 Susceptibility testing for non-Proteus Enterobacteriaceae against chloramphenicol and colistin was done with 47 randomly selected isolates
  5. 4 Susceptibility testing for P. aeruginosa against chloramphenicol and colistin was done with 42 randomly selected isolates
  6. 5 All MIC ≥64 mg/L including Providencia, Morganella, Enterobacter and Serratia spp.
  7. 6 All MIC = 4 mg/L