TABLE 3.

Incidence of single and multiple resistance patterns in fecal E. coli from sows and pigs exposed to high and low antibiotic use

Resistance pattern	% of isolates with indicated resistance pattern from animals and farm type (n)a
	Sows		Pigs, 7 days		Pigs, 35 days		Pigs, 63 days
	HU (322)	LU (140)	HU (1,731)	LU (747)	HU (1,683)	LU (729)	HU (999)	LU (407)
A-C-G	0	0	0	0	1.5	0	0	0
A-C-G-N	0	0	0	0	1.2	0	0	0
A-C-G-N-O	0.3	0	1.3	0.1	19.7	0.1	14.8	2.0
A-C-G-O	0	0	0.6	0.1	19.2	0.3	3.2	2.7
A-C-N-O	0	0.7	0	0	0.1	0	0	0
A-C-O	0	0	0	0	0.1	0	0	0
A-G	0	0	0	0.1	0.1	0	0	0
A-G-N	0	0	0	1.5	0	0	0	0
A-G-N-O	0	0.7	5.4	6.6	13.0	0.7	7.6	0.3
A-G-O	0	0	0.9	0.8	6	5.9	3.7	1.0
A-N-O	0	0	0	0	0	0	0.1	0
A-O	0	0	0	0.9	0.1	0.1	0.1	0
C-G	0	0.7	0.1	0	0.4	0	0.3	0
C-G-N	0	0.7	0.1	2.1	0.3	0.1	0.3	0
C-G-N-O	10.6	20.7	0.1	7.4	6.1	5.4	13.8	5.9
C-G-O	3.8	14.3	7.9	6.3	4.3	4.0	10.5	7.4
C-N	0	0	3.4	0	0	0	0	0
C-N-O	0.9	0	0.1	0.13	0.6	0.4	1.9	0.3
C-O	2.2	1.4	0.4	1.6	1.8	6.9	2.5	2.5
G-N	0.3	5.0	1.0	3.5	0.2	2.2	0.1	0.3
G-N-O	40.1	25.0	33.1	21.8	13.0	30.0	22.1	23.8
G-O	19.9	15.7	19.5	25.4	6.8	22.4	9.4	29.2
N-O	4.0	1.4	5.8	1.1	0.7	2.7	3.8	2.0
A	0	0	0	0	0	0	0	0
C	0.1	0.7	0.1	0.9	1.7	0	0	0.3
G	0	3.6	0.6	5.9	0.1	6.5	0	0
N	0	0	0.2	0	0	0	0	0
O	17.4	5.0	16.7	10.8	2.9	11.0	5.2	22.6
Sensitive to all	0.6	5.0	1.6	3.35	0.1	1.4	0.5	0

^aStandard errors were approximately 10% of the percentages, so least significant differences ranged from approximately 1 to 10, with higher values occurring with the larger percentages.