HI we just went thur that this is what I did and had great resluts. 1 first thing in the morning when the chickens go out of the coop use a Adams flea and tick fogger and follow the directions on the package. 2 Use Garden & Poulty Dust you can find that in the garden area, put this anywhere that your chickens may use for dust bathing. 3 I use Tylan, they got no relief from terramycin, you will need the powder that you mix in there drinking water. Also you may need someone to help you determine the dosage for there drinking water. 4 I had a Roo that was infected with egg sacks I bath him in flea shampoo and the next day I sprayed the areas with Adams flea and tick, egg spray. Am happy to say that with much trial and error this worked the best my chickens are mite,lice and infection are gone. There getting new feathers in and there skin look health. There breathing is health. If you eating there eggs you need to stop until there health again.