I still need advice on this chick, if anyone is able to help. It is still gaping, and I'm thinking it is doing that because its nasal passages are stopped up. It is still strong and eating, but opens its mouth to inhale much of the time.
Initially I could see a little discoloration around the nostrils, like there was a discharge. I took it out this evening to get a better look at it, and could see some dried crud around the nostrils. I made up a solution of VetRx and used that on Q-tips to gently clean the crud from the nostrils. One of the nostrils looks normal after cleaning - the other looks strange - the hole is not distinct and it looks a little red between the nostril and the eye where I believe a sinus is located. I will continue with frequent VetRx cleaning of the nostrils. (Boy, that stuff smells good! I'm going to get it out when I have a cold!)
Do you think this could be infectious coryza? I don't know how the chick could have been exposed - I have them in my den and have been careful to wash hands and change clothes between chores with the hens outside and chores with the chicks. If it seems like infectious coryza, should I change from tetracycline in the water to erythromycin?
I haven't done anything with Oxine yet - a little reluctant to try that on a 9-day-old chick.
Still no signs of illness in the other chicks, even the little cockerel that I put in with the gaping chick for company.
What else could cause this problem? What else should I do?