I have a young pullet of about 3 months. She developed a severe infection in her eye and I have her separated from the flock while I treat her. I had two other bird that also got an infection, but they healed up very fast and are now doing great after being treated. I have all the birds relocated to another area while I cleanse the pen. I am a little paranoid about this stuff. The problem is I have treated this one pullet with tylan 50 and Vetrx for about a week now, just like the others but she is not responding well. Her eye is completely closed and very swollen. She does act like she feels better, but I am nervous about ever putting her back with the flock. Should I go ahead and cull her, or continue treating her eye. I want to do what is best for the flock, so if culling is the answer then I want to end her misery and get it over with. Any suggestions.