Brucellosis has been eradicated from domesticated cattle herds in all U.S. states. However, B. abortus is still present in wild bison and elk in the greater Yellowstone area. The updates seek to increase the ability to detect brucellosis with a high degree of confidence and avoid potential zoonoses.
Source: Feedstuffs, November 11, 2022. Link.
Also see: Brucellosis: Brucella abortus fact sheet, The Center for Food Security and Public Health, May 2018. Link. Brucellosis is a zoonotic bacterial disease caused by several species in the genus Brucella. Each species of Brucella tends to be associated with a specific host, but other animals can be infected, especially when they are in close contact.
Cattle are the usual hosts for Brucella abortus. This organism also causes brucellosis in bison, water buffalo, camels and elk, and occasionally affects other species.