Animal Diseases Research Unit, USDA-ARS, Washington State University, Pullman, Washington 99164, USA. hli@vetmed.wsu.edu
Malignant catarrhal fever (MCF) caused by OvHV-2 occurred in ranch bison herds separated by significant distances from feedlot lambs. Mortality rates correlated with distances: 17.5%, 6.1%, and 0.43% at approximately 1.6, 4.2, and 5.1 km, respectively. The study further defines the importance of distance of species separation for MCF control.