I treated my entire flock yesterday after noticing one of my younger hens had white little bugs all over her! I cleaned the coop with seven dust and bleached it. I didn't see any of these bugs on any of the other chickens, but still bathed them in seven dust and used a flock spray protector on them (probably something I should do every 6 months anyway) I have my hen quarantined in a dog kennel she is very sick looking, still drinking/eating once awhile but otherwise she can't walk well and she just lays there. I checked her over this morning and honestly didn't see any more bugs but am still going to treat her again in a week. Do mites/lice cause such a effect on a chicken? I gave her duramycin in case she also caught a cold or something.... I just didn't thin they would cause a chicken to get sick like that? I am hoping I caught it early enough!