Hawkeye-I gave my little hen LA200 1/4cc into the breast meat. She is doing much better, but we still have her under observation. I would have given her an injection of the baytril, but I don't have any (yet). Also, get online and order some VetRx. Smith's poultry supply carries it and they ship very fast. If you order it early tomorrow you might have it on Saturday. I put some on a Q-Tip and smear it on their comb, beak and around their face a little. It acts as a decongestant. I believe that "yawning" motion they make is because they are congested, kind of like when you have a stuffy nose and can't get air through it.
I have my little hen in a wire dog kennel in the house. She is rather entertaining. She is feeling better, so she is "talking" a lot more. We actually let her out and let her wander around over under my husband's double-yellow headed parrot's cage. He throws a lot of his food around, so there were a few interesting tidbits for her to look around for. She has become very tame and likes to sit on my hand, my foot or my lap. I guess I would say she is my first "pet" chicken. I've raised quite a few chickens, but I've been lucky and have never had any sickness with them, other than treating chicks for mild ailments. Treating sick chickens is a pretty new ball game for me.