Table 2.

Farm A: Month of sampling, numbers of animals sampled, animal code, number of lactations, age of animal, E. coli serogroup isolated, shedding status, and virulence characteristics.

Month of sampling	No. Lactating animals sampled	Animal code	No. of lactations	Age of animal	E. coli serogroup isolated	Shedding status CFU/swab	Virulence status of recovered isolates
							stx1	stx2	eae	hlyA
August, 2013	38	VFSL434	3	4y7m	O157	10	–	+	+	–
November, 2013	37	VFSL364	5	6y7m	O26	10	–	+	+	–
		VFSL731∗	2	3y5m	O26	10	–	+	+	+
		VFSL432	3	4y7m	O157	<10	–	+	+	–
		VFSL531∗	2	3y1m	O157	<10	–	+	+	–
		VFSL331	6	7y7m	O157	<10	–	+	+	–
		VFSL435	3	4y7m	O157	<10	–	+	+	–
January, 2014	35	VFSL887∗	1	2y6m	O157	<10	–	+	+	–
		VFSL537	2	3y3m	O26	10,000	–	+	+	–
		VFSL473∗	4	6y8m	O157	<10	–	–	+	–
February, 2014	39	VFSL703	2	3y3m	O157	<10	+	+	+	–
		VFSL887∗	1	2y7m	O157	<10	–	+	+	–
March, 2014	40	VFSL165	11	12y7m	O157	<10	–	+	+	–
		VFSL434	3	5y2m	O157	<10	–	–	+	–
		VFSL887∗	1	2y8m	O157	10	–	+	+	–
April, 2014	40	No STEC Detected
May, 2014	38	VFSL326	6	7y7m	O157	<10	–	+	+	–
		VFSL405	3	5y7m	O157	<10	–	+	+	–
		VFSL531∗	2	3y7m	O157	<10	–	+	+	–
July, 2014	38	VFSL731∗	2	4y1m	O26	<10	–	+	+	+
		VFSL473∗	4	7y2m	O26	<10	–	+	+	–

^∗animals positive for STEC more that once during the 1-year sampling program.