Looks like Speckled Hen answered my question:
"Many of the deaths I've read about here and have received calls about go something like this:
'I rec'd this bird from x. Brought it home and didn't quarantine it. Within a week it was dead and now I'm worried about my flock!'
The assumption...
Curious if this 30 day quarantine is applicable to juvenile pullets from a reputable hatchery, as well? I have on the way in October, two juvenile pullets from My Pet Chicken hatchery. I ordered them a month ago and cannot wait! My current six very happy hens free-range, etc. I have an enclosed...