well, I decided to go ahead and give the girls a preventative dose of Denegard. I purchased it from QC supply a few weeks ago and been holding off because I am still not sure their sneezing is not environmental. They otherwise seem healthy, no other symptoms that I've noticed. There is plenty of coop ventalation, but still, it gets dusty when I rake the pine shavings (until it settles again). The major factor that pushed me to go ahead was that my husband was sick last weekend and this morning I woke up with a cold. since I am the one who changes water and food in the mornng, I figured it would be good to administer, just in case. Don't need my ladies picking up what we've got (if thats even possible) and I read on BYC that you can still eat the eggs, so we'll have a few for our friends coming into town this weekend (only 1 girl laying so far)! Thought I would share my experience in case anyone out in BYC land is in my shoes and not sure what to do, and because the directions on the bottle are quite intimidating. With some math skills provided by my DH, here is what we came up with: We have a 2 gallon waterer of which I added 1oz Denegard (1 shot glass - just be sure you don't use the extra large shot glass that lives in the back of the liquor cabinet, lol!) I also added 1oz of local honey (read alot about Denegard on BYC and it was recommended - apparently Denegard is quite bitter) Hopefully they are happy, healthy and actually drinking the water! I will update you on the progress (if any) cheers!