First off, let me just say a HUGE thank you to those of you who have given generously of your time, wisdom and experience. I have spent quite a bit of time here doing research. etc., and the information has been EXTREMELY helpful. (And on a side note, I found this site --also very helpful, and with pics for diseases.) So in my excitement about having chickens, I completely ignored the whole quarantine thing. Lesson learned the hard way. Argh. I have MG in my flock. Nothing else (at least on the one bird I had tested). Some birds are showing the classic symptoms; some are not. I have had them on duramycin for about a week and a half. Two are now symptom-free; three kind of teeter between clearing up and then getting congested and conjunctivis again. I know that many here recommend Tylan 50 over duramycin, and I have it. But I am also kind of wondering what happens if you don't treat? I have learned how common MG is, and obviously, my flock is closed now. At the same time, I'm not really a fan of nursing the sick birds along forever--kind of a survival of the fittest, as it were. I would love to hear any experiences on this. I assume that I may have to cull those that continue to worsen, but do some of it just get over it and bounce back? Thanks so much!