My 6 weeks old pullets were just fine. I relocated them from the brooder box into the shed. They were fine there for a week. Then I got 25 10 week old from a person who sold me them. I got them couple of days ago when the cold front kicked in. For 4 cold nights they were all together in a small shed. Yesterday I hear some whistling noises out of my little 6 week old pullet. Today all 50 birds are sneezing and make whistling sounds. Two 10 weeks old have swollen eyes. What is it? I never had this kind of thin before. Did I bring something into my flock? Could it be something to do with a bitterly cold weather? Will I loose all of them? What should I do? How to make them better and how to treat them? Please help!