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Volume 19, Number 12—December 2013

Dispatch

Transmission of Brucellosis from Elk to Cattle and Bison, Greater Yellowstone Area, USA, 2002–2012

Jack C. RhyanComments to Author , Pauline Nol, Christine Quance, Arnold Gertonson, John Belfrage, Lauren Harris, Kelly Straka, and Suelee Robbe-Austerman
Author affiliations: National Wildlife Research Center, Fort Collins, Colorado, USA (J.C. Rhyan, P. Nol, L. Harris, K. Straka); Natural Resources Research Center, Fort Collins (A. Gertonson, J. Belfrage); National Veterinary Services Laboratories, Ames, Iowa, USA (C. Quance, S. Robbe-Austerman)

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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.

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