What you both said, EBH and Iowa Granny.
Mass produced turkey (or chicken for that matter) is closely monitored for this in the US. What you are going to find in your supermarket counter (Butterball, Tyson, etc) will be perfectly fine as long as proper handling, and proper cooking temperatures are observed.
We cannot emphasize this enough.
Domestic Poultry is SAFE. But don't leave it thawing on the kitchen counter for a week before cooking it.
The reason I am leary of Free Range birds is because of the possibility of them being infected by the feces of migrating birds which might be infected with AF. That's not to say all migrating birds are carriers, only that the potential is there.