Hi, recently I had to cull a hen who had been sneezing and chronically got worse, going from little sneezes and heavy breathing to coughing and wry neck. I had been using Tylan in her water but she seemed to be far too gone. I just noticed one of my leghorn hens sneezing a bit today, and immediately did quarantine. Is this ok? I put Tylan in her water and gave grower/layer mix to her, and she drinks and eats fine. She lays everyday too, but doesn't breathe heavy like my last hen. She's 8 months old and not obese or too skinny. Her poops are fine, look like normal chicken poops and not bright green or mucusy. *edit* Any help would be awesomely appreciated!