One of my ladies clearly has lice- mostly around her vent and tail feathers. I've given her a bath and sprinkled pyrethim garden and poultry dust on her feathers. Another hen has either mites or another small creepy crawly, also around her tail feathers. Have gone through the same process with her. I also lightly misted the rest of the flock with a liquid spray version of the pyrethrim as a preventative measure. After the first application, how often do I need to do this? Just as needed upon inspection or within a certain day interval to complete treatment? Also, for those who have experienced mites and lice in their flocks, is this a common occurrance or rare? These creepy crawlies give me the heebie jeebies and I'm not sure I can handle having to take of these issues on a regular basis.