Are Vaccines only for chicks and not for adults. I have a small flock so I am not worried about Mareks (SP) since it mostly strikes younger chickens and the youngest are 28 weeks, the older are almost a year old. I do have two Buff Orpington chickens around 18 weeks old that are separated from the flock until they become older. They are housed next to the hens so they see each other daily but not about to get to each other. Should I vaccinate the chickens for other health concerns or is it too late?
