Yellowstone Park bison herd a highly contagious zoonosis caused by ingestion of unpasteurized milk or undercooked meat from infected animals, or close contact with their secretions. Brucellosis occurs naturally in the Yellowstone Bison Herd and the normal winter migrations of bison outside the park have raised concerns that Brucellosis infected Bison may infect cattle. The United States government has programs to eradicate brucellosis in domestic livestock. Since 1934, an estimated $3.5 billion in federal, state, and private funds has been spent on brucellosis eradication in domestic livestock. Over the years, the National Park Service and states bordering the park have implemented various plans to
Raw milk 1890s. This move successfully controlled the spread of highly contagious bacterial diseases including "E. coli", bovine tuberculosis and brucellosis (all thought to be easily transmitted to humans through the drinking of raw milk). In the early days after the scientific discovery of bacteria, there was no product testing to determine whether a farmer's milk was safe or infected, so all milk was treated as potentially contagious. After the first tests were developed, some farmers took steps to prevent their infected animals from being killed and removed from food production, sometimes even falsifying test results to make their animals appear free