So, I am trying to help a couple friends with an issue. Friend A, breeds and sells hatching eggs. Both friends exchanged hatching eggs. Friend A hatched 15/20,2 were own eggs. Friend B said their flock had MG because some were showing symptoms. Friend A shipped a total of 74 eggs. Eggs were due to hatch yesterday. 5 so far. One chick that hatched had a swollen eye, and a grey spot on the other(blind?).the claim of friend A's flock of having MG was made. I would really appreciate any links that can inform about MG. there are so many questions I would like to try and answer to help them. Friend A feels their reputation is on the line when it may not have anything to do with them. Friend A would like to test their flock, but don't know where to go for information about doing it. Some questions I have pertaining to MG... 1.Is it possible for chickens to have just a cold, without it being MG? 2.Is MG airborne or only contagious through contact with leakage(like shared water) 3.Can an entire flock exist for a year with no signs and still carry it? 4.is MG passed through eggs of parents who never showed symptoms 5.can MG be spread to hatching eggs that are turned by hand, from flock owner of known mg? Friend B will not test flock because they want to breed for disease resistance. Would their entire flock die if they have it and are not treated?