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I did a little reading on this. I think that, again, this is one of those things that mostly affects folks with compromised immune systems. Just my opinion but, as I'm reading about it, I think being afraid of this is similar to how folks worry about their children out playing in the dirt and try to keep them germ free. I think that most of us have healthy immune systems and the exposure we get every day as we're working around our flocks helps us to build immunity.
One more thought on this... Remember how when you do the deep litter without adding DE/PDZ, etc. that it allows the growth of BENEFICIAL bacteria, molds, and nematodes? (Kind of like yogurt or ff...the good stuff outnumbers and keeps the bad stuff in check...)
I'm also thinking that using the Deep Litter and allowing it to become inhabited with the good stuff will also keep this from being an issue for us. All the more reason to keep that DL going and composting with dirt from the local environment!
Here's a couple links on beneficial Deep Litter:
http://naturalchickenkeeping.blogspot.com/p/deep-litter-method.html
http://www.themodernhomestead.us/article/Deep-Litter-1.html
(Be sure to read Page 2 & 3 on this article also.)
http://www.themodernhomestead.us/article/Brooding-Chicks-Deep-Litter.html