I'm not sure it's size that makes the difference.
Large companies can easily look the other way on disease, slaughter them and sell them to food stores. I know for a fact that a local foodstore in New Jersey, repackages hambuger AFTER it the expiration date and sold it as "fresh" and a new expiration date. They were eventually nailed on that but this went on despite "regualtions" for a long time - more than a year. As always there are some people that don't care and their only interest is in the $$$.
IF the disease progresses from human to human, THEN that is where the pandemic happens. Till then you have to be concerned about where you purchase your meat and hope it is not diseased.
I understand but our government is known for over-reacting. I can see them wanting control and knowing where all the birds are. It's already started with having to register your animals.