I have an EE that is in quarantine for an eye problem and while checking her out yesterday found out she was infested with mites. We had been using DE throughout the yard for fly control and few other pest but guess we missed the wood box and old herb garden which is now my new broody/hospital box and attached mini run. None of the other chickens have bugs so we are pretty sure they came from there. Rubbed Sevin all over her and rechecked her in the evening and all the mites were gone from her so now we just have to redust in 7-10 days and I think this will be all cleared up.