Lisa, I don't think it's the fodder either. Also, if you want to keep their tummys happy, and them, I use the plain Yogurt for that. I saw on the old timers about fermenting, but, I know the yogurt pretty much does the same thing. It sounds like it could save a little on the feed bill, but I am thinking not that big a difference. I was almost ready to do it.
Not sure about the worming thing, in fact, there is a lot of debate about dewoming chickens. Just keep yours chickens on a good diet, keep a clean area for them. And, I do not..believe...it has to be bleach clean! Two seconds later, there's poop. Oh well, back to your drunk chickens.
I sure hope that's all it is, because I can't imagine your chickens being sick, but you never know where it comes from. Some people think they get sick because it's cold. Nah, the cold won't cause it. It's a virus, just like we get colds..from other's or touching where other's did with their dirty cold infested hands. Yuck. Also, and I know you probably know this one, if you just put down some fresh shavings..that can be pretty dusty..and they will sneeze for a while if they were in it while you put it in, or if they got into it right after. If that AVC is going to change the color of my eggs..I'm not using it! I loove..love, my Wheaten Am. egg!! So pretty. Finally one the bluest I've had in a long time. 
Not sure about the worming thing, in fact, there is a lot of debate about dewoming chickens. Just keep yours chickens on a good diet, keep a clean area for them. And, I do not..believe...it has to be bleach clean! Two seconds later, there's poop. Oh well, back to your drunk chickens.

