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Clean the Turkey's eyes with saline and a warm cloth. Terramycin eye ointment from the feed store or plain neosporin can be used in the eye twice a day. Vetericyn eye gel can be used instead. MG is not as highly contagious as some diseases, but many times can be spread on shoes, clothes, and equipment. I would do a search on MG in chickens and read all you can. Google it. For big turkey or chicken farms, it is a big deal, and most cull sick chickens. For backyard flocks, most close their flocks to new birds. Vaccines are available, but you should first make sure that is what is going around.