Need a little advice. I am treating my flock for bacterial infection after my son got into chicken poop and put it in his mouth. He got sick about 2 days later, his stool was tested. Flock has been on amoxicillin for 7 days, now suddenly I have a hen in the same flock who suddenly has sneezing, wheezing, nasal discharge, and gurgly breathing. Shes on amox already, should I continue this or maybe isolate her and switch to tylan? I am a little confused how shes sick now when theyve all been on meds for 7 days. I do let them out in the yard during the day, maybe shes been finding other water to drink?? Please be kind, I don’t like overusing antibiotics but I am a little at a loss on this one and just want to help her.