Noticed one of my hens (tara-Blk copper Maran)with a droopy watery eye a couple weeks ago. She was very lethargic and was sleeping all the time. When I picked her up she was warmer than usual. I kept watch on her and she seemed to be getting better. I Isolated her for a couple days and gave her vancomycin. I also gave the rest of the flock the same for about 7 days. It is useless. My Blk copper Roo had a rattle in his chest and his crow was weak. They were all sneezing. I did some research on the internet and found a lot of info on the efficacy of Tylan. Although it is off label and not "technically" for use in chickens. All the info I found was positive. So I am hopeful this will work. I will be devistated if I loose my flock. I had to order the Tylan from a vet supply store in CA. http://www.calvetsupply.com/ It is not cheap $49.99+ s/h for 100g jar. I had it overnighted fed ex because I wanted to get them started on treatment right away. Dose I used 1 1/8 tsp 2 1/2gal water. Mix in a 1 gal container like an old milk bottle and then add to water. I use room temp water and it dissolves in water completely. I am changing water and adding new dose every other day. There is conflicting info on dosing though. It states on the bottle tx anywhere from 1-3 days or up to 5 depending on severity of sx's. But a lot of my research indicates for symptomatic flock is 7-14 days. I am going to start with 7 days and observe their sx's daily. If I note their sx's are completely resolved by the 7th day I will end tx. But in case of the ladder, I will continue to 14 day tx. I am then planning on using some poultry nutri drench in their water to build up their immune system. Luckily it is spring here in Puget sound WA. It is still a little cold but has been warming up in the afternoon. I let them out in their run if its fairly nice out. But if I think its too windy and cold I am keeping them confined in their house. I hate to do that but its necessary for their health. My flock is spoiled so their house is very clean and they have a lot of room to move around. I will keep you updated on their progress. Anyone else have any encounters with this? Also, I am assuming that now that they are all carriers of CRD I will not be able to hatch and sell any chicks from this flock? I wouldnt sell anyone else a chick from a carrier flock. Is this correct? I am still fairly new to this. My orig flock started last year with 3 hens. I now have 6 hens and 3 Roos.