It\'s not required for NPIP, but if you send a bird to the state lab for a necropsy (which I\'ve done), they are tested for MG. If you sell a bird to someone else and it comes up positive, the flock of origin is tested (this happened to a guy I know, but fortunately for him, his flock was clean, the birds were apparently infected after he sold them). If you are found to have a positive bird, your entire property is put under quarantine. While it is my understanding that they cannot force you to destroy your birds, they become essentially worthless because you can\'t sell or show until the quarantine is lifted, and it\'s lifted when your entire flock tests negative (i.e. all the positive birds are dead, since that is the only legal way to get rid of them).
Commercial poultry is big here - NC is the 4th largest state for broiler production & the 2nd highest for turkey. The big boys (Tyson, Perdue, Sanderson, Raeford, etc.) pretty much own the state. Neither vaccinating nor breeding for resistance (btw, Mike, I agree with you) is cost effective for them, and the rest of us have to bend to their will...
Edited to add: If I understand Dr. Mason correctly, if you report to the state that you are vaccinating you won\'t be put under quarantine, as long as nothing is showing symptoms.