Bacterial Epidemiology and Antimicrobial Resistance : 2007 Veterinary Isolates Final Report- Accessible Version

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 notes:

CLSI: Clinical and Laboratory Standards Institute M100 Document