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It is good that your young birds are bigger, and may not be affcted too badly if they get the virus, if that is what is going on. IB is easily spread in the air and by direct contact with secretions. If you should ever lose a sick bird, and hopefully that won't happen, I would contact your state...

I would guess that your chickens have a case of infectious bronchitis, a virus that is the most common respiratory disease of chickens. It can be spread by contact with a sick chicken or from wild birds. Most grown chickens tolerate it okay, but might experience a drop in laying for a few weeks...