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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