I have done some research on this before, and a lot of the responses list respiratory illness. however, they also list discharge from the nasal area, which our birds do not have. I've been keeping an eye on them for a few months now, no increase in symptoms, the sneezing persists, but no discharge and no deaths. Does this mean that perhaps it is something else? I will be the first to admit their coop probably needs to be cleaned. They have three coops within the enclosure and plenty of room to run around and get fresh air. The coops have heat lamps and the food supply is ample and diverse. Are there perhaps any other environmental factors that could be responsible for the sneezing? For us, and my girlfriend especially, culling the flock isn't an option. We also have plenty of land and no issue with setting up another enclosure separate from these chickens. (Also what is a safe distance? We have a spot thats 200 feet from the other coop). I saw the other option being referred to as "closing the flock" This is something I have more questions about. Are we unable to hatch eggs harvested from this flock? Is the illness, if it is that, passed down through eggs? Keeping the adults in the enclosure for the rest of their days isn't an issue for us because it is large and well populated with plants and features for them to perch on and explore. They are still all happy and harmonious for the most part. So basically my key question here is am I able to continue to hatch eggs from this flock if they are taken on the day they are laid and incubated in the house? Thanks all!