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Mycoplasma gallisepticum is extremely common here. The severity of the infection will depend on your birds' breeding. If bred for resistance the birds may get a minor sniffle or two, like a mild cold, and then they are done with it. If the birds are not resistant Mycoplasma can be brutal. My goal for breeding is to build resistance to all the local stuff.
Mycoplasma hit my flock last summer when the humidity kicked in. Most of them only got minor sniffles. One got rattly lungs. I culled him. Now the humidity has begun to kick in again. The birds that hatched this year are starting to sneeze once in a while. If any get really sick I will cull them, but I expect them to be as resistant as their parents were.
Resistance to local diseases is one more reason to buy from a good local breeder.