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Most chickens are carriers of a disease called coryza. They don't show symptoms though making it impossible to tell without trial and error. Quail catch it and it spreads like wildfire.
Do you know, can chickens then be tested for coryza?
I'm almost positive they can, but if they are ever around any chickens or if you are ever around any other birds you can pass it on to them making testing useless. Unless your flock is completely isolated. I know they can test if the birds show symptoms, not sure about carriers though.