So, I had a flock of two hens who had gotten over a respiratory infection after a two week course of duramycin a month ago. I introduced some new birds I had bought at a local poultry swap. The man assured me they could go right in with my other birds and that they had had all their vaccines. Like a fool I listened. Less than a week later, one of my older birds started gurgling. I believe that these birds might have already had their laryngotracheitis vaccines and spread it to my other birds. I am in the process of obtaining oxine to fog my coop with, the gurgley one has been quarantined and I have already disinfected many surfaces with diluted bleach water. I'm feeding the sick girl well but she really has no appetite. I am going to buy the laryngo vaccine from poultrysupplies.com. Should I give this to my old birds even though they've already been exposed to the vaccine? Should I give it to my new birds though I suspect they've already had it? In your experience, is there anything I could do to comfort or raise the chances of survival for my sick one? Please help!