Table 1.

Total number of samples screened (S) and number of positive samples (E) in age groups 1–4 and slurry for each sampling time (T0–T12) for 10 conventional dairy cattle farms selected after Phase 1 (T0), during 2014–15

		T0 Phase 1		T2 Phase 2		T4 Phase 2		T6 Phase 2		T8 Phase 2		T10 Phase 2		T12 Phase 2		Total
Farma	Sample	S	E	S	E	S	E	S	E	S	E	S	E	S	E	S	E
4*	Group 1	8	—	12	—	3	—	4	1	6	—	4	1	3	—	40	2
	Group 2	21	1	4	—	15	2	4	—	11	—	9	—	24	—	88	3
	Group 3	32	—	1	—	8	—	1	—	6	—	10	—	23	—	81	0
	Group 4	30	—	7	3	3	—	8	—	13	—	10	—	23	—	94	3
	Total 1–4	91	1	24	3	29	2	17	1	36	0	33	1	73	0	303	8
	Slurry	4	1	4	—	4	—	4	—	4	1	4	—	4	—	28	2
5*	Group 1	10	—	6	—	6	1	9	—	13	—	7	—	2	—	53	1
	Group 2	29	—	10	—	18	—	7	—	24	—	14	—	40	—	142	0
	Group 3	29	—	5	—	8	—	0	—	25	—	5	—	41	—	113	0
	Group 4	29	—	2	—	12	2	10	—	6	—	5	—	33	—	97	2
	Total 1–4	97	0	23	0	44	3	26	0	68	0	31	0	116	0	405	3
	Slurry	5	1	5	—	5	—	5	—	5	—	5	—	5	—	35	1
7	Group 1	2	—	5	—	2	—	2	—	1	—	1	—	3	—	16	0
	Group 2	19	—	2	—	5	—	2	—	13	—	1	—	9	—	51	0
	Group 3	22	—	1	—	1	—	0	—	5	—	3	—	19	—	51	0
	Group 4	30	—	1	—	2	—	4	—	5	—	4	—	15	—	61	0
	Total 1–4	73	0	9	0	10	0	8	0	24	0	9	0	46	0	179	0
	Slurry	5	1	3	1	1	—	1	—	3	—	3	—	2	—	18	2
10	Group 1	8	—	9	—	7	—	11	—	6	—	6	—	4	—	51	0
	Group 2	28	—	8	—	28	2	5	—	17	—	6	—	27	—	119	2
	Group 3	22	—	2	—	7	—	6	—	20	—	3	—	32	—	92	0
	Group 4	28	—	8	—	1	—	9	—	5	—	8	—	15	—	74	0
	Total 1–4	86	0	27	0	43	2	31	0	48	0	23	0	78	0	336	2
	Slurry	5	1	3	—	3	—	3	—	3	—	3	—	3	—	23	1
11	Group 1	2	—	6	—	6	—	3	—	8	3	9	1	4	—	38	4
	Group 2	30	—	3	—	20	—	9	—	21	2	9	—	37	—	129	2
	Group 3	31	—	8	—	24	2	3	—	22	14	16	—	36	—	140	16
	Group 4	29	—	5	—	8	—	7	—	7	2	12	—	17	—	85	2
	Total 1–4	92	0	22	0	58	2	22	0	58	21	46	1	94	0	392	24
	Slurry	3	—	3	—	3	—	3	—	3	2	3	1	3	—	21	3
12	Group 1	1	—	7	1	3	3	9	3	4	3	10	—	4	—	38	10
	Group 2	22	—	1	—	18	2	6	2	19	—	13	2	28	—	107	6
	Group 3	21	—	3	3	9	—	0	—	20	—	2	—	15	—	70	3
	Group 4	29	1	3	—	4	1	5	2	4	—	12	—	10	—	67	4
	Total 1–4	73	1	14	4	34	6	20	7	47	3	37	2	57	0	282	23
	Slurry	2	1	2	1	2	—	2	—	2	—	2	—	2	—	14	2
14*	Group 1	4	—	9	—	11	—	5	—	7	—	16	—	6	—	58	0
	Group 2	28	—	4	—	11	1	11	—	15	—	6	—	44	—	119	1
	Group 3	29	—	0	—	0	—	0	—	9	—	4	—	32	—	74	0
	Group 4	28	10	19	18	24	8	26	4	26	19	38	—	47	—	208	59
	Total 1–4	89	10	32	18	46	9	42	4	57	19	64	0	129	0	459	60
	Slurry	3	—	2	1	2	—	3	2	3	—	3	—	3	—	19	3
15*	Group 1	3	3	2	2	3	3	5	4	3	3	5	2	5	3	26	20
	Group 2	33	4	7	3	27	5	14	8	17	1	14	6	15	11	127	38
	Group 3	30	2	8	9	22	1	8	8	28	1	12	1	34	26	142	48
	Group 4	29	16	24	7	24	23	26	11	27	2	37	—	41	42	208	101
	Total 1–4	95	25	41	21	76	32	53	31	75	7	68	9	95	82	503	207
	Slurry	2	1	2	2	2	2	2	—	2	1	2	1	3	—	15	7
18	Group 1	2	—	3	—	5	—	8	—	1	—	3	—	2	—	24	0
	Group 2	16	—	2	—	9	—	4	—	13	—	1	—	19	—	64	0
	Group 3	21	—	3	—	11	—	0	—	11	—	4	—	18	—	68	0
	Group 4	30	—	2	1	4	—	5	—	2	—	6	—	6	—	55	1
	Total 1–4	69	0	10	1	29	0	17	0	27	0	14	0	45	0	211	1
	Slurry	2	—	2	—	1	—	2	1	2	—	2	—	2	—	13	1
19*	Group 1	4	—	3	1	9	4	4	1	7	—	7	—	7	3	41	9
	Group 2	28	2	5	5	17	9	18	1	23	—	16	—	29	—	136	17
	Group 3	30	1	6	5	12	12	13	4	23	4	19	2	37	1	140	29
	Group 4	30	10	14	14	20	20	23	2	27	1	28	1	30	—	172	48
	Total 1–4	92	13	28	25	58	45	58	8	80	5	70	3	103	4	489	103
	Slurry	4	2	4	—	4	2	4	—	4	2	4	2	4	—	28	8

Eight farms (4, 5, 7, 10, 12, 14, 15 and 19) were selected because of ESBL presence. Farm 11 and Farm 18 were selected based on the absence of ESBLs in Phase 1.

^aFarms included for analyses of AMU are indicated with an asterisk.