One of my chickens has been sneezing for the past few days. I googled in and most places said they’ll get over it but I’m worried it’s getting worse. I noticed this morning she had a little bit of mucus coming out of her nose. She’s acting totally fine walking around eating and drinking like normal. I put some apple cider vinegar in their water thinking maybe it would help but I don’t think it is. One of my other chickens sneezed today and I’m getting worried that maybe there’s some kind of chicken cold in my flock. I clean their coop once a week and make sure they have fresh water and food daily. Just wondering if there’s anything else I can do for her. Thanks.