About a month ago, my cochin pullet developed puffy eyes with a clear discharge coming from them and mucous discharge from her beak. She was very lethargic and would occasionally gasp for air. I separated her from the flock and gave her 2 cycles of Duramycin 10 in her drinking water. 7 days each cycle with a 7 day space between. She is still lethargic and the eyes are still swollen with clear, bubbly discharge. I found an NFZ puffer and have been applying it to her eyes topically, with little improvement. Next steps? Am considering Tylan 50 injectable.