I have taken much from this site so I though I would add some. My first 4 chickens came from a resale place that orders through ideal. When I went to purchase, I was told I could not go back because there had been issues with people transferring disease on there shoes and clothes from flocks at home. Made sense to me. Brought home chicks and they had little sneezes about two weeks later ( purchased as 7 week old pullets). These were the first ever on property and had not been allowed out on ground yet. I waited it out as I wanted to raise organic. Went away for most part. Moved to coop at about week 12 and little sneezes still happening but now with the occasional, thin, clear mucus from nose and occasional snot bubble. One in particular worsened to the point I decided to medicate. Administered i.m. Penicillin for 3 days. No improvement, possibly got worse. Called around and read on this forum. Purchase Tylan soluble for about $50 bucks. Cleared it up pretty well. Months later, lost some to ant bait and was given 4 laying hens from a friend. Never sneezed before, layed everyday. About 2 weeks after being here, sneezing and way decreased laying. I now have 30, day old chicks on the way and have spent DAYS researching what to do to prevent a huge loss ( dont wont to pump broilers full of meds). Have them all on Tylan again and are improving. Called the place I originally purchased from and they confirmed they have had issues with this and that every hatchery in America has this. I was doubtful so called Ideal, manager said " we are not considered Mycoplasma negative but have never had a problem". OK. Call Murray McMurray... we don't test for that. Called Meyer and waited for 10 mins before hanging up. So. My plan is to order the $98 vaccine and give to all new arriving as well as me hens once they are asymptomatic. According to label it doesn't prevent disease but symptoms of.. fine with me. The 30 coming will have it regardless as it is passed through egg but now wont exhibit symptoms.. I will take what I can get. Also plan to not purchase outside if I can avoid it and hopefully, eventually, develop a negative/resistant flock. I have read much about culling all birds. If you live in Tx, odds are your bird came from Ideal or the breeder you bought from has gotten birds from Ideal. I still think they are a fine company as apparently either people test and are "not negative" or don't so they can honestly say "don't know". I am not condoning that we should be indifferent to this problem, but as it stands, there seems to be no avoiding it. My personal belief is that it is due to the majority of poultry being raised in sterile environments and shipped all over to climates and soils that contain things that the chick has no inherited immunity to. I think buying originals from a hatchery is ok, but have Tylan, buy the mg bac vaccine, and try to breed from then on, in theory, every year the chicks will be a bit more resistant and suited for your environment. I would say not to cull your flocks as the odds are pretty certain that you will get it again and then just be out those birds for nothing. As far as giving, trading, selling birds... I had decided that I would never, so as not to pass this on to someone.. now, if ideal has it, and M.M. probably does as well, is it unethical to gift/sell chicks to someone who purchased there current chicks from there as well?? I don't know. Either way, I am resigned to this and calmer now. I have a plan and knowledge. I hope this takes the panic out of others as well. P.s.... mine never acted really sick, had smelly discharge, foamy eyes, thick or colored discharge etc. This threw me off in my journey to diagnosis and probably has others. Just a small sneeze with clear spray. I am going to experiment with cheaper meds if I have another symptom outbreak, but hope not too. Will report in a year if the vaccine prevented symptoms in an already infected flock and if it prevented symptoms in the day old chicks. Best of luck everyone and may this help someone not spend weeks of sleeplessness. Last thing, mycoplasma, mg, crd... all close enough for government work.. yes some differences.. but for our needs they are caused by same things, have same effects, treated with same drugs, etc.