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Many people here on BYC have dealt with Mareks disease in their flocks. Some birds may not get the symptoms, and many of those people will breed those birds to get chicks who may resist the disease. If you get more chicks in the future, it is best to vaccinate them, and keep them away from the...

Here is a good list of diseases and symptoms including mycoplasma gallisepticum and infectious coryza: https://edis.ifas.ufl.edu/ps044

It sounds as though there is a chronic respiratory disease running through your flock. It may have been brought in by one of the new additions over the years. Diseases can be dormant in a carrier for awhile and come out during periods of stress. Also some wild birds can carry mycoplasma (MG,)...