I just read a news release on the MT Department of Livestock webiste that a bison heifer carcass tested positive for Anthrax in Gallatin County. Field tests were done on the dead bison which was found near a pasture where Anthrax killed 287 bison in 2008. The pasture has since been quarantined.
There is a vaccine for anthrax, and the state vet encourages produces that live in areas known for anthrax to vaccinate.
You can read the whole news release on the MT Department of Livestock website.