I've seen all sorts of infestations. For large infestations a dip made from Permectrin II or Ravap EC does the job. It should be done on a warm day so birds don't get chilled. Wear OB gloves like the horse folks use. Submerge the birds in a mixed solution up to their necks so you don't get any in their eyes or mouth. You can use Adam's flea dip for dogs too. With either Permectrin II or Ravap, a solution can also be made to spray the birds. Frontline spray is also a good product since it only takes a small spritz right below the vent where Northern Fowl Mites like to congregate. Re-infestations often happen because the coop environment hasn't been treated. Wild bird nests in range areas can harbor breeding grounds for mites too. When you have an infestation, all coop litter must be removed from the house. Shop Vac it too. Treat all nests, floors, roosts, walls, cracks, and crevices with the Permethrin/Ravap solution. I do this every three months and never have mites/lice on the birds.
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