A quarantine would be little to no help if a bird had Mareks. Birds can have it for a lifetime and never show symptoms, plus since it is spread by dander if there is an infected bird on your property it will spread in the wind or on your clothes/shoes etc...You mean it may not have been the rooster? Or that maybe even while quarantined some dander affected the flock?
How old was the rooster? I know chicks need to be a few weeks old before they can show signs but I am not sure what the time frame is for adults (whether it would take 3 weeks). It is possible the flock already had it and it just popped up now due to the stress of adding the rooster, probably not that likely but certainly possible.
Hopefully the facility doing the necropsy knows what to look for. I paid $150 for a necropsy at UGA (a top vet school) and they totally missed it because they looked for lesions and some forms do not cause lesions. Had I known better I would have ordered a specific test instead of letting them wing it.
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