I've had chickens for months now and was a "newbie". Well I have put in a lot of time and research and learned through heartbreak. Our chickens have been battling respiratory illness for months. I finally sent one out for necropsy after lots of failed vet appointments and recommendations. We came back positive for MG. My instinct from what I now know is to cull my flock. It stinks, but I am getting much more into chicken keeping, hatching, selling etc. and I can't morally do that without a healthy flock. The question is this: The vet I spoke with said 6 weeks of sitting and heavy sanitization of the coop are in order. BUT he said that the dirt run would never be safe again...and since mine also free range it's basically a death sentence for any and all future birds forever. Anyone else have other information? Links I can read on this? Is it really forever? I want more chickens once these are culled, but don't want to have to go through this nightmare again. PLEASE help!