I really thank you for this clarifying information. To say I was flying blind is an understatement. I did not treat them with permethrin, I only cleaned the coop and drenched everything with 2 oz 36% permethrin in a gallon of water. Opened everything up and made sure it was bone dry before putting the hens back in. This vet caused me more grief than I can even write down. He first said she had an abdominal tumor. I insisted on an X-ray and he then said she had lung tumors, granulomas from the lice. So I will never know if she could have been saved. She was sick for sure, but since he never mentioned the abdominal tumor after the X-ray is very much troubling to me now
I'm so very sorry. Sometimes even when we seek professional care we can be left with more questions than answers. I hope if you have to use a vet again, that you find one that is willing to explain things more clearly and has a compassionate heart.