Dr. Damien Barrett:

Yes, but we have scenarios here where we have flying herds being encouraged. What must be borne in mind here is that an individual farmer could have his herd 100% closed. If he has a flying herd beside him, however, that may introduce disease to badgers. That farmer, then, through no fault of his own, may see his herd infected. If there is a flying herd beside him, that may be a source of infection for the badgers. That may, in turn, be a source of infection for that farmer's herd. I feel very sorry for those people with closed herds where, through no fault of their own, the disease may be introduced.