That is right. Treatment with antibiotics may help symptoms to go away, but the disease lasts for life. But you cannot just diagnose MG with a picture. It needs to be confirmed by testing. There are many different respiratory disease, and sometime more than one can affect your chicken. Many backyard flocks may be positive for MG, since it is common in birds that come from other owners, and wild birds can spread it as well. The flock should remain closed from birds leaving or entering the flock.
