I think I have finally killed all the lice. Knock on wood, cross your fingers, and throw some salt over your shoulder. I got three new birds earlier this fall. They have been quarantined forever (over two months). They were completely healthy, except for lice. The lice didn't show up until they had been here a month. I started treating them. I kept seeing fewer and fewer lice as I treated, but before this last treatment I couldn't find any lice. I treated them again (per my vet's instructions), but now I'm antsy about moving them into the bigger coop. How long have any of you waited before reintroducing lice victims back into the flock? I have two older hens in a brand new coop...I really don't want to transfer lice. P.S. They were treated with oral ivermectin and dusted with poultry dust.