I know there is a lot of threads out there about this but I am upset and would love some advice. We lost our first chicken today to, we think, Marek's. The vet said that is what they think it is but without doing a blood test they cant confirm. We chose not to do that. Her symptoms definitely line up. We have 16 other chickens. From what I read there is really nothing I can do (short of vaccinating them all)... correct? If we did vaccinate them... any idea what the cost on something like that is? They have a large run they are in all day so it is very ventilated. I am so sad - these truly were our pets - and now I am terrified we will lose them all. Thank you. Edited to add: I did more reading and can see that it really is not effective to vaccinate an older chicken. I also called the place we got the majority of our chickens and they do vaccinate all of their chicks so I feel a bit better. We do have 3 others from our first flock (different place) so I am worried about them. Are there any early signs to watch for? And if you notice early enough is there anything you can do about it?