First of all, i would not do the pyrmethrin and the ivermectin on the same chicken at the same time. Both can go into the blood, and though if you do it on the legs the pymethrin SHOULDN'T don't mean it won't.
Ok, so i think these are your options, for safety's sake; You can do the ivermectin on everyone, and the vasaline. If nothing else this will keep the mites from spreading. You could buy the permethrin and dilute it according to the directions on the bottle for spraying the coop, and use it to spray the roosts really good. That will stop the little buggers from crawling in the night!
OR you could treat the mites first, then ivermectin everyone; if you do this still vasaline the others as a preventative. This is the treatment i have come up with that should work in the first try, unlike the old methods that required dipping twice a day for weeks; this is the same dose of pyrmethrin as the human treatment for scabies, which is very similar.
I can't say for sure that it wipes them out in the first treatment, but it does in humans and i'm fairly certain it does for them too. I swear if hen's could smile.........the hen i treated looked so much more RELAXED the next day; they must itch! I did do it twice to treat my hen, once a week for two weeks. Still much easier than the old way! Do not eat the eggs for a long time though; just to be safe! I gave it a month and erred on the side of caution! Probably only needed a couple weeks, but i am sensitive to pymethrin and get sick to my stomach from touching it. Wear gloves if you are that way, it is the same stuff as what's in dog flea stuff too.
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