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Yes, I would have to say yes, most of our birds are MG positive.
Unfortunately it is all repetitive! Thanks for asking me to edit.
From what I know and not being a professional, you need to ask your local tester to come test your flock to know for certain if you have the antibodies for these diseases. Be it NPIP, MS,MG, and all those, when you know for certain, then you can be sure of your "status". Then you need to talk to the hatcheries that you receive birds from- eggs you get in the mail to hatch or chicks you receive, then you will know absolutely what status you are keeping in your flock.
Often it is not recommended to have different aged birds together, I am not exactly positive the true reason, except for stress, different lines/illness unless these eggs are from your flock.
When purchasing birds, buyer be aware.
Those that are in showing birds have no fear of the mycoplasmas, and as someone pointed out to me (at the wrong time- lol) these diseases don't kill. Ugh, no they don't, but its the secondary lung infections, bleeding sinus infections from a immune by injection ILT. Like I say, be aware of who your local government testers are, avoid swapping birds- especially ones from a show line unless you quarantine for a full term! (and then some).
When allowing our birds to work through these conditions/illness', then in reality we are allowing them to build an immunity, making it easier for the body to keep under control- a lot like germs and virus' for us.
Another wonderful reason to have a small closed flock tested is so that you are aware of what your birds have, then you can test new birds to know they are OK to mingle with out own birds. But I bet that is a pipe dream and I feel you should only do that with your own birds, and should NOT be mandatory within the back yard population. See, all commercial birds are given the shots to protect them from all these conditions and regulations. They are now contagious.
Unfortunately, you cannot immunize your birds and sell them with a clear conscious, with poultry (I believe- correct me if I'm wrong) there immune systems, unlike ours, will make them healthy, but now are carriers that you will be passing this on to.
Gosh, if you read the Chickens do no get colds, I'm repeating all the time, there is no right or wrong answers, just how you want to handle your poultry. We need breeders, we need see that others can grow, educate and find that no ones right has to be your own, just make sure we teach the new comers, and if you inoculate your own flock, please tell someone that may be purchasing your bird, as they will be healthy in quarantine.