I need some advice on a 8 week old chick I have had in quarantine for 2 weeks. I decided to add 2 Black copper Marans to my other 15 week old silkie and EE flock. I wanted to add before all were grown and thought it would be easier to add now instead of when they were older. I found a man on Craigslist who hatches chicks and talked to him extensively, about this. I hatched my own chicks, however always wanted some dark brown eggs eventually, yet never had any luck hatching those BCM eggs. So 2 weeks ago I went and bought 2 of his BCM chicks that are somewhere between 8-9 weeks old. Needless to say, the brooder was overcrowded, and they didn't have much human interaction before we got them. They seemed very frightened of us for days and days. I finally got them eating out of my hand, after 2 weeks, however 1 chick constantly sneezes. She has since the day I picked her up in the car ride home. Of course I looked her over before picking her, yet as would be the case she started sneezing halfway home!! Anyway since it seemed they were overcrowded and the poop seemed a bit odd, I asked on the forum about it, and it was sugessted I put them both on corid. They were on it for about 5 days and the poop seems back to a normal color. However this chick is sneezing since that first day. No other signs of illness, she eats fine drinks fine, seems healthy otherwise, yet even though I have put her on staight newspaper and paper towels to be certain it was not the dust factor she still is sneezing. I was wanting to introduce them to my other chicks soon, as I am on a time schedule to get them all out to the coop at our farm by spring break, I am concerned about this one chick getting the others ill. What in the world could this be? I have looked over different illnesses, and I am just stumped about this one chick. What would cause this yet show no signs otherwise? After 2 weeks I thought something would come about if she did indeed have a illness, yet the whole time the other BCM chick in quarantine with her is fine. Sorry about the lengthy post, I just am worried about my other chicks I have babied since they hatched. BTW no one has had any vaccines, and I have the fowl pox vaccine waiting to give them all at the same time before placing them in our coop. (South Texas has horrible mosquitos and last summer I had a flock who had fowl pox.( I don't have them anymore) Thanks in advance for help.