http://www.cdc.gov/niosh/hi97146.html It's a fairly lengthy read, but I'm wondering if the "dust" I've been enhaling while fooling with my birds every day has been the reason I've been on a strong antibiotic for about a month now trying to rid a chronic sinus infection. I've had allergy and sinus problems for years, but have had a horrible time with it for the past few months. I've just started wearing a dust mask when doing stuff around my birds, and thinking about going to a respirator. I'm too into the quail thing to be told that I need to get rid of them to get rid of my health problem It's something to think about. Your thoughts??