So I posted a month ago about a hen I had who was off one leg. I initially thought bumble foot and kept her isolated, quiet, administer penicillin, etc. Then she got overall weaker on the other leg and stopped supporting her weight. This took about a month to happen. She is still eating and drinking well but is very thin. I took her to the vet suspecting Marek's and they are doing a blood test to see if that's the case. Initially when I isolated her I gave her pour-on ivermectin. Today I was cleaning up her poopy feathers and she blasted me with diarrhea in which I found a long white worm. I had assumed the ivermectin would have addressed that (she had it weeks ago) but maybe it is not effective against round worms? I found another worm just like it in the (normal looking) poop of a healthy chicken. So, clearly I have a worm infestation and have to worm my flock. My question is - I know ducks can go off their legs if they have a serious enough worm infestation. Can the same be true of chickens? I feel so stupid for not thinking of this sooner. Also, I have wazine I can give them. I'd prefer something without a withdrawal period if there are any other options but obviously the priority is to deal with the worms ASAP.