I got a hen awhile back and noticed she had what I thought was poo stuck around her vent. I bathed her and trimmed it. Started her on probiotics etc.. I kept her quarantined but other then that never had an issue. The lady we got her from was a vet tech and a friend of my dh so didn't think much about her health. Well after awhile all my hens were scratching and looking disorderly. I realized it was poultry lice after doing some research. I'm sure the other hen I brought in had it and I had just thought it was like ibs. I've treated all my chickens and ducks with ivermectin and recently noticed red mites on my broody. I dusted everywhere with 7 dust. Just not sure what to do because I've already treated with ivermectin which is supposed to take care of poultry live, mites and some worms. Should I treat them again or find something else?