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Table 2 Susceptibilities of MDR M. tuberculosis isolates of 2009 to fluoroquinolonesa

From: Persistently high prevalence of primary resistance and multidrug resistance of tuberculosis in Heilongjiang Province, China

MIC (mg/L)

Levofloxacin

Moxifloxacin

Sparfloxacin

Gemifloxacin

Gatifloxacin

No.

%

No.

%

No.

%

No.

%

No.

%

≤0.125

      

2

3.8

1

1.9

≤0.25

7

13.4

5

9.6

14

26.9

7

13.5

8

15.4

0.50

10

19.2

18

34.6

9

17.3

14

26.9

15

28.8

1 mg/L

15

28.8

15

28.8

10

19.2

9

17.3

7

13.5

2.00

8

15.4

9

17.3

8

15.4

14

26.9

12

23.1

4.00

8

15.4

3

5.8

7

13.5

6

11.5

7

13.5

8.00

4

7.7

2

3.8

3

5.8

  

2

3.8

16.00

    

1

1.9

    

MIC ≥ 2 mg/L

20

38.5

14

26.9

19

36.5

20

38.4

21

40.4

MIC50b

1.0

 

1.0

 

1.0

 

1.0

 

1.0

 
  1. a MDR multidrug resistance, MIC minimum inhibitory concentration
  2. bMIC50, minimum inhibitory concentration required to inhibit the growth of 50 % of examining clinical isolates