Everyone should read this thread about Biosecurity. https://www.backyardchickens.com/forum/viewtopic.php?id=17696 It is very important that you quarantine your birds no matter the source and if you have even one sick bird, your moral obligation is to NOT sell, swap, trade or give away any birds from your flock until you isolate the problem and fix it. This is probably the main reason the rules and regs are so tight anymore, IMO. Too many of our members have been devastated by bringing in a sick chick or hen. Don't take a chance on it happening to you!