Well, the SF roo in the coop they formerly resided in has lice. I treated the 5 with ivermectin and Poultry Protector spray, several little sprays on the back, stomach, vent, and under each wing for all of them. The coop has sand for the main area and pine shavings and PDZ for the egg boxes. Do I need to dump the sand or, being inorganic, is it ok to leave? What else should I do? The two fellas just had their crates deep cleaned last Sunday, can the lice spread from one chicken to me to another chicken? Or do the chickens have to be physically touching for bird to bird infestation?