We now have a third bird with a swollen eye. It's much worse than the other two were, who only had a swollen eye for a day or two and then it was gone. This one looks much worse and is almost all the way closed. I've been reading that I should start the flock on antibiotics, and I'm wondering if that means I need to toss the eggs while they are on Tylan. does it pass into the eggs? I don't know where this disease could have come from - it is a closed flock. I suppose from a wild bird?