Never had red mite in my flock, and count myself very lucky. But ....was horrified a few weeks back, to see the little blighters on the door of a coop. I have the old fashioned proper hen sheds, but someone gave me some hens and bantams, and offered me the hens home for free. Obviously I took up their kind offer!! Its one of the ones, with a mesh run attached, little house above, and two nest boxes. Only a few banties go in there, so never much bedding or dirt in. I am not wondering if these sort of coops are more prone to red mite. Like I said, never had a problem before in my old style sheds. Anyway, coop, and occupants fully dusted and cleaned, and the red mite seem to have gone.