I got some new birds today from a guy with a nice, clean set up. All his birds looked healthy and he was very educated about chickens...more so than the last place I got birds from... When I got home it was quiet in my yard and I realized one of the 16 week old Ameraucana pullets was making a purring sound. Then she coughed or sneezed. None of the other birds sounded like that, no one else is sneezing/coughing. She is bright eyed but I noticed she was sitting down on the ground while all the other birds ran around. I have Tylan 50--should I start treating her with it? Should I treat all the birds in the pen, or just her? Also, since I've had a terrible time with cocci lately, would it be alright to go ahead and put Corid in their water as a preventative? Is it bad to use Tylan and Corid together? Sorry, so many questions... The new birds are isolated in a covered chicken tractor, I'm so glad I decided to do that. The chicken tractor is open on the ends, there's no coop. Do you think they'll be alright in there for several weeks to a month? There is a roost pole, and it's covered in a tarp to keep rain out. I don't really have anywhere else to put them since I live in the city.