Yes, you are correct, I am fighting lice. I had asked someone on here that had battled lice & they had said that everything would be gone including the nits. However, I will do some more research as you suggested. That would be bad if I've been subjecting these 2 chickens to all these treatments if it was really already cleared up!I don't know for certain BC I don't know what you're fighting but I'm guessing lice. We've just had a fight with northern fowl mites and I think we've finally got them gone. However in my reading it seems to me that I was reading often if the nits have been killed they stay in the feather shafts until the feathers are molted. I'd do some more research before deciding to cull.