11 Tips for Keeping Healthy, Stress-Free Chickens
Use quarantines whenever necessary.
One of the easiest but least practiced things a home flock owner can do to maintain healthy chickens is to quarantine all new birds and all chickens that come back home from a show or sale for two weeks, well away from the rest of the flock.
If you have sick chickens, they should be moved away from the rest of the flock and quarantined to try and prevent disease spread. Injured birds need to be quarantined also, so the others don’t pick on them.