I started treating my chickens with Valbazen two weeks ago for worms, and I noticed two roosters that I was given by someone that didn't want them had some sticky mucus in their mouths when I picked them up and had labored breathing but no rattling or wheezing. They are not tame like my hens so I had to chase then around a lot, and I was unsure whether or not that would cause the mucus. A while after treating I noticed my hens began sneezing and shaking their heads some, however there is no liquid coming out of their eyes or nostrils, no rattles, wheezing, coughing or gaping either, just a lot of sneezing in some individuals. I have been treating with VetRX and I think it may have helped some, but there are a few still sneezing, with one particular hen that looks very congested as her comb is now floppy and I can see in her face that she's a little more distressed than the others. Although, they all act completely normal and run about the yard besides the sneezing. When the roosters sneeze, it sounds somewhat more snotty while the hens squeek and sound congested. I also noticed one of the older hens I was given had somewhat of a manure smell to her, she's been in molt for a while now so could this cause somewhat of an odor or is this completely unrelated? It was coming from her body and not her nostrils as far as I could tell... I read that chickens do not get colds, however on the VetRX package it says for poultry with colds. I have also read that once chickens get a respiratory illness they're ruined if you are planning on introducing future chicks/pullets because they'll always be carriers since most respiratory problems are caused by viruses. Will this pass? Will I always have respiratory issues in my chickens now? Will I have to kill my present chickens to get new ones if I want to sell hatching eggs, chicks, or started pullets? These birds mean the world to me and I already have over $200 in medication and home remedies to treat the sick birds, I'd hate to cull any of them... I had 3 out of 4 hens I was given almost die to coccidiosis and one to a stressful worm infestation and molt this year already... now I'm stuck with this when my original hens were perfectly healthy... Please help! Thank you in advance!