I don't know if this has been talked about before but I wanted to warn you ! I was sick 4 weeks ago with severe like symptoms and trouble swallowing food. Then last Sunday I had 103 fever and flu systems again ! (I have had a flu shot) One of our BYC members answered a post from me asking if I could get sick from chickens. Told me to look up Histoplasmosis. I did and then called my doc. She did blood test and that is indeed what I have. There is a fungus in every chicken area especially in the litter ! If you don't wear a mask anytimeyou stir up shavings or clean up poop you can inhale these fungus spores into your lungs !!!!! This can make you very sick and if your immune system is week it can cause major damage to organs like lungs and liver etc. I am lucky that my immune system has been able to fight it off by itself with out any sign in my chest xray. PLEASE BE VERY CARFULL WHEN IN THE COOP ! WHEN YOU CLEAN IT OPEN ALL DOORS AND WINDOWS ! WEAR A MASK !!!!!!! Stay healthy and protect yourself. It is most common in Central and eastern united states according to the CDC. Google Histioplasmosis and there is alot of info.