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United States Department of Agriculture

Agricultural Research Service

Related Topics

2007 Veterinary Isolates Final Report- Accessible Version
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1 - Introduction, Materials and Methods and Data Analysis
2 - Antimicrobials and breakpoints
3 - Isolates tested- all organisms
4 - Salmonella (Tables 1 and 2)
5 - Salmonella (Tables 3 and 4)
6 - Salmonella (Table 5)
7 - Salmonella (Table 6)
8 - Salmonella (Table 7)
9 - Salmonella (Table 8)
10 - Salmonella (Tables 9-12)
11 - Salmonella (Tables 13-16)
12 - Campylobacter (All tables)
13 - E. coli (All tables)
E. coli (All tables)
 
 
Table 1. Number of E.coli Isolates Tested from Chickens, 2000-2007

2000

2001 2002 2003 2004 2005 2006 2007
Chickens

285

1989

2100

1365

1697

2232

1357

1510

 

 

Table 2. Distribution of MICs and Occurrence of Resistance among E.coli Isolates from Chickens, 2007
%I %R 95% CI 0.015

0.03

0.06 0.125 0.25 0.5 1 2 4 8 16 32 64 128 256 512 1024
Amikacin

0

0

0.0-0.3

 

 

 

 

 

1.7

32.3

54.8

10.1

1.1

 

 

 

 

 

 

 

Gentamicin

6.7

38

35.6-40.5

 

 

 

 

9

37.5

5.8

1.1

1.9

6.7

16.9

21.1

 

 

 

 

 

Kanamycin

1.7

7.7

6.4-9.2

 

 

 

 

 

 

 

 

 

81.9

8.7

1.7

0.6

7.2

 

 

 

Streptomycin

N/A

47

44.5-49.6

 

 

 

 

 

 

 

 

 

 

 

53

24.2

22.8

 

 

 

Ampicillin

0.1

18.7

16.8-20.8

 

 

 

 

 

 

20.1

43

17.9

0.3

0.1

0.8

17.9

 

 

 

 

Amoxicillin-Clavulanic Acid

0.5

11.2

9.7-12.9

 

 

 

 

 

 

6

38.1

35.8

8.5

0.5

9.2

2

 

 

 

 

Ceftiofur

2.6

7

5.8-8.4

 

 

 

8.5

49.1

30

1.7

1

2.6

5.4

1.6

 

 

 

 

 

 

Ceftriaxone

2.6

0.1

0-0.5

 

 

 

 

88.1

0.5

0.7

0.3

2.1

5.6

2.5

0.1

0

0.1

 

 

 

Cefoxitin

1.9

10.3

8.8-12.0

 

 

 

 

 

0.1

2.4

25.1

46.9

13.4

1.9

6.5

3.8

 

 

 

 

Sulfonamides

N/A

53.2

50.6-55.7

 

 

 

 

 

 

 

 

 

 

42

4

0.1

0.2

0.4

53.2

 

Trimethoprim-Sulfamethoxazole

N/A

7.9

6.6-9.4

 

 

 

63.7

17.4

5.9

4

1.1

0.1

7.9

 

 

 

 

 

 

 

Chloramphenicol

0.6

2.3

1.6-3.2

 

 

 

 

 

 

 

14.6

61.5

21

0.6

0.2

2.1

 

 

 

 

Ciprofloxacin

0

0.1

0-0.5

90.6

5.1

0.2

2.1

1.7

0.3

0

0

0

0.1

 

 

 

 

 

 

 

Nalidixic Acid

N/A

4.2

3.3-5.4

 

 

 

 

 

2.5

26

55.4

11.5

0.3

0.1

0.9

3.3

 

 

 

 

Tetracycline

1.8

40.2

37.7-42.7

 

 

 

 

 

 

 

 

58

1.8

6

17.2

17

 

 

 

Table 2 notes:

95% confidence intervals for percent resistant (%R) were calculated using the Clopper-Pearson exact method

Antimicrobial subclasses and susceptible, intermediate and resistance breakpoints can be found in the antimicrobials and breakpoints section. 

N/A- Not applicable 

 

Table 3. Percent Antimicrobial Resistance among E.coli Isolates from Chickens by Year, 2000-2007

 

2000 2001 2002 2003 2004 2005 2006 2007
Amikacin

0

0

0

0

0

0

0

0

Gentamicin

40

33.4

38

38.8

39.1

36.7

33.1

38

Kanamycin

16.1

14.5

11.6

10.3

11.5

10.3

9.1

7.7

Streptomycin

77.5

65.8

65.1

64.2

64.1

58

49.5

47

Ampicillin

20

19.5

19

18.6

17.6

22

25.6

18.7

Amoxicillin-Clavulanic Acid

8.1

10

10.9

11.1

8.8

10.6

16

11.2

Ceftiofur

6.3

4.4

5.5

7.1

4.9

6.5

10.2

7

Ceftriaxone

0

0

0

0

0.1

0

0.1

0.1

Cephalothin

17.9

12.9

15.1

16.6

NT

NT

NT

NT

Cefoxitin

7.4

8.7

8.5

8.3

8.2

9.9

15

10.3

Sulfonamides

57.9

58.2

46.1

43.9

53.2

51.9

48.6

53.2

Trimethoprim-

17.2

12.6

10.4

10.5

10.7

10.4

8.4

7.9

Chloramphenicol

4.6

2.4

1.8

1.3

1

1

1.9

2.3

Ciprofloxacin

0

0.2

0

0.1

0.2

0.4

0

0.1

Nalidixic Acid

10.2

8.4

6.8

6.2

6.8

7.5

5.4

4.2

Tetracycline

68.4

61.6

58.6

52.2

50.3

48.9

1.3

40.2

Table 3 notes:

NT: Not tested

 

 

Table 4. Percent Frequency of Resistance Patterns of E.coli Isolates, by Year, 2000-2007

 

2000 2001 2002 2003 2004 2005 2006 2007
No Resistance detected

10.2

12.9

15.9

16

17

17.7

18.6

24.4

Resistance >1 CLSI subclass

89.8

87.1

84.1

84

83

82.3

81.4

75.6

Resistance >2 CLSI subclasses

76.8

21.7

68

65

66.5

64.7

62.9

60.8

Resistance >3 CLSI subclasses

55.1

34.2

43.3

38.9

42.3

41.1

42.9

36.1

Resistance >4 CLSI subclasses

18.9

7.9

13.8

13

11.5

14.7

16.6

12.6

Resistance >5 CLSI subclasses

7.7

4.1

6.6

6.4

4.8

6.8

7.3

6

Table 4 notes:

CLSI: Clinical and Laboratory Standards Institute M100 Document

 

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Last Modified: 11/21/2008
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