As mentioned, the national program, being administered by states, each state is a bit different in the procedure.
Some states require a percentage of all birds on the property to be tested. In still others, like MO, every bird over 4 months of age must be tested.
It is pretty simple and goes as...
I'm not in PA but MO. State regs are different in this national program but as far as I know, there is no such rule about runs and coops.
The fastest way to get an official answer is to call them. I always get an answer here when I call with a question.
717-783-6897
717-783-6677.
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