I have to disagree. I have never seen it, nor have I heard of such a thing. I do know that chickens will eat maggots alive, and it's good for them to.Glad you caught it and were able to get the help you needed.....maggots will literally eat a chicken alive.
Like others have stated, getting the coop in order and cleaning it out would be a good thing. In Jamaica you don't have to worry about cold, but a dry space for them to roost would be a good thing. Maggots are also a very nutritious meal for chickens. So lots of maggots could be a good thing, just not in the coop bedding imo.