One reason I do Bangs vacc on my heifers... They get one shot, 4-12 months age time line.. Done for life. My heifers can get shipped anywhere in the country... but I also do it for the Tattoo in their ear. IDENTIFICATION...
Used to be dairy farmers routinely vacc for bangs... because of the transmission in raw milk.... then considered eradicated... I do not want to find out that somewhere we brought in a problem... like smallpox... stop it BEFORE . Yes they will always show positive... just have to provide that they were vacc against it and they can be taken anywhere...
Domestic bison should get bangs vacc to stop any spread... in some of the western states Bangs is still mandatory for any animal shipped over state lines..
Be smart... do them... It is not that expensive, a one time thing... You will need very strong working facilities for the bison... they do need treating on occasion... and just do the heifer calves.