So this afternoon I noticed that one of my BR chicks (3 weeks old) was sneezing. She does it pretty frequently, about every couple minutes. I also noticed she had a very runny poo that shot out a couple inches. I segregated her and she's inside and I hope she's OK, but I'm also worried about the other 14 chicks that were in with her. I did have to cull a bird today - but she wasn't exhibiting the same symptoms. The culled bird wasn't eating or drinking, gasping for breath - but no runny poo or sneezing. So, does anyone have any ideas what this could be? Any suggestions on how to keep it from spreading to the others?