I a an idaho resident and federally accredited veterinarian.
If I signed a health certificate for cattle coming in or out of this state with a viral disease that there is no vaccine for.
I would be swinging from a rope.
An ounce of prevention is worth a pound of cure.
I would close all borders to tourists.
A lot of small towns need to do exactly this. They are not equipped to deal with large outbreaks.