I need help here, I recently bought 2 pullets to add into our small backyard flock of chickens. One was obviously sick because I heard one sneezing here and there, and now my ROOSTER has been having trouble breathing and has been picked on from his flock.. He was at the top of the pecking order, now he's last. I picked him up to hear his breathing, I put my ear to his back and you can hear the congestion in his body just like someone with Bronchitis What do i give him ?? What will make him better, and what steps should I take from this point to increase his health. I've never vaccinated a chicken, I've been giving them medicated chick food since day 1, now they're going on 15 weeks old and this crap happens. I should've known better than to introduce chickens form somewhere else. Any advice and/or help here is really appreciated.