I have a 3 year old Americauna who has had a chronic respiratory problem for almost a year. It goes through cycles of better/worse/better/worse...She usually has eye bubbles and when its worse she has ALOT of bubbles and obvious copious amounts of nasal discharge with sneezing. She's been separated from the rest of our flock for months because we can't figure out what to do. I've tried various other treatments and just gave her a 7 day round of Tylan and while it improved it still isn't gone. I don't know what else try? Our local poultry vet is unavailable due to COVID.