Written by: Dr. Jacquie Jacob, University of KentuckyInfectious bronchitis (IB), also referred to simply as bronchitis or a cold, is a virus that affects chickens. A similar disease can affect bobwhite quail (quail bronchitis), but it is caused by a different virus.Infectious bronchitis is highly contagious and can spread quickly through a flock. The virus is spread through the air and on feed bags, infected dead birds, and rodents. The virus can also be transmitted through the egg to developing embryos, but an affected embryo typically does not hatch.
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