It started when she was a chick. She had a foamy, frothy, bubbly eye occasionally so I would flush it with saline and put some erythromycin on it. This usually helped. She was never sneezing, coughing, weezing, any of that so I didn't think it was Upper Respiratory disease. She is now 5 months old and the bubbly eye is back full force. Still no sneezing or anything. I'm afraid she might lose her eye in the next couple weeks. Over 5 months, none of the other chickens have shown similar symptoms so I don't think it's something contagious. Also, she twitches her head a lot..like every few seconds. Maybe to fling the foam out of her eye.. She doesn't itch it too much. I've heard eye worm. I gave her a dewormer pill from the guy at the feed store a few days ago. Her eye is only getting worse. What could this be?? Any help would be appreciated. I am not going to kill her, thank you.