Table. Cattle and ranched bison herds found infected with Brucella abortus due to transmission from elk, Greater Yellowstone Area, USA.

Herd no.	County, state	Species	Herd size	Date detected	Seropositive, %	Culture results	Distance to feeding ground, km
1	Fremont, ID	Cattle	50–100	2002 Apr	12.0	Biovar 1	50*
2	Sublette, WY	Cattle	>300	2003 Oct	9.9	Biovar 1	2.4
3†	Teton, WY	Cattle	>300	2004 Jun	1.9	Biovar 4	Adjacent
4	Bonneville, ID	Cattle	<50	2005 Aug	20.0	Biovar 1	85‡
5	Park§, MT	Cattle	>300	2007 May	0.2	Biovar 1	>100
6	Park, MT	Cattle	<50	2008 May	2.9	Biovar 1	>100
7	Sublette, WY	Cattle	>300	2008 Jun	5.5	Biovar 4	24
8	Jefferson, ID	Cattle	>300	2009 Jul	1.5	Biovar 1	85
9	Park, WY	Cattle	>300	2010 Oct	1.1	Biovar 1	>100
10	Park, WY	Bison	200–300	2010 Nov	11.5	Biovar 4	>100
12	Park, WY	Cattle	>300	2011 Feb	0.9	Biovar 1	>100
13	Park, WY	Cattle	>300	2011 Sep	1.2	Biovar 1	>100
14	Park, MT	Cattle	>300	2011 Sep	2.0	Biovar 1	>100
15	Madison, MT	Bison	>300	2011 Nov	0.2	Biovar 1	>100
16	Fremont, ID	Cattle	50–100	2012 Apr	5.8	Biovar 1	90
17	Bonneville, ID	Bison	200–300	2012 Mar	0.7	Biovar 4	40

*Elk were also intentionally fed on ranch by owner.
†Brucellosis was detected in 2 herds that were pastured together during spring of 2004. This was considered a single transmission event, and statistics are given for the combined herds.
‡Herd located 0.8 km from site where elk feeding ground had been until 2003.
§This herd was discovered infected in Carbon County, MT, in 2007, but animals had been transported from Park County in 2005. Index cow aborted in 2005 and did not calve in 2006.