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yes they have. that is why, when buying poultry or any fowl from another individual, it is best practice to quarantine the new birds for at least a week. most will do longer than that.
that's also why alot of people get scared to have their birds tested along with they don't want the government to know they have chickens.
a friend of mine recently bought a bird off eggbid. the seller said she was npip certified but when she got the silkie, there was no paperwork attached. she's called and emailed the seller to no avail. so she's having the tester come out to test the silkie. the silkie is healthy, but just for her peace of mind.
getting your flock tested is really a great resource. the testers are usually veteran poultry person and are a wonder of information. they also have many friends that raise chickens and so if you're looking for a particular breed to raise, they can usually help you find one locally.