i have 3 chickens that in the last couple of years have had what I thought was mycoplasma. I had them to a vet and he just said “respiratory infection”. I have treated them with Tylan, Baytril Tetracycline per vet but they didn’t seem to improve to where they didn’t have symptoms. One of them has been cruddy for several weeks, slinging her head, bubbles in one eye, nasal discharge but no coughing or sneezing. This evening I noticed she had swelling under her eye. I decided to put VetRx in each nostril and rub it on her comb until I could get on BYC. It was so hard to restrain her she is as wild as a crane, but as I leaned over her she opened her beak and there was the nastiest smell, the smell of infection. When I came in I got online and googled her symptoms and infectious coryza was the first diagnosis. To me that makes more sense since she doesn’t have any lower respiratory symptoms. Under treatments the only one I haven’t used is erythromycin and I have some some 100 mg power that I bought a few months ago but never gave. I want to give her this and see if she can get some relief. I don’t want to medicate the other 3 so I wanted to ask if I could put it in a treat and give it to her that way instead of putting it in the water for all. I have no way to separate her from the others. I don’t know what the dosage would be she is only 3 or 4 pounds. If somebody could just give me their opinion (as long as isn’t to cull her) and the dosage I truly would appreciate it. I would like to start treatment tomorrow whether it would be to put medicated water out for all of them, 2 of them are symptomatic but their symptoms are not as pronounced as hers. I also have a 7 month old australorp that somehow has not gotten anything.....yet