I have 8 hens and at least the 6 of them have bubbles coming out of their nose and I think I hear them sneeze. They also have a squeak like bark. I gave them Ivermectin Pour-On for Cattle about 2 weeks ago. I knew they were gasping or at least opening their mouths with a throat action. I tried to research and figured they were wormy and had mites or lice. After just googling a picture for both I think lice. Two weeks later being time for the 2nd dose they never stopped with the squeak sound they do it ever so often. I have 2 Rhode Island Reds 2 cinnamon queens 2 Red stars 1 black Australorp and 1 buff Orpington. Worried I’m treating them wrong if the symptoms haven’t changed or stopped.