I also, am too new to offer much help, but when I had a sick hen that I had to cull Friday, everyone on BYC said to wash out all the nesting boxes and the food and water bowls, and the whole coop with a bleach solution. I did that 2 weeks ago and put all new bedding, and so far none of my other chickens are showing any signs of being sick. Good luck, hopefully someone else will chime in.