Hi. I'm new to this forum; I found it in search of an answer to a question I have. Sorry this post is a bit long, but I want to explain the situation fully. Is it possible for a chicken to show symptoms of Marek's if the chicken is over two years old? We have a hen who started in April being unable to jump onto a perch in the coop at night. She showed progressive weakness so she came into the house with us and has been here since then. She went through a period where she couldn't walk at all and seemed to have trouble seeing. We hand fed her, making sure she got as much food and water as she wanted, and kept her area clean. She progressed to being able to stand up and take a wobbly step or two. She then began eating on her own. She would get progressively better, walking steadily, eating well and even enjoying being taken outside for dust baths, and then suddenly she'd relapse. She also seems to have occasional seizures. She's a house pet now - she's not very strong (never was a very hefty girl) and on the rare occasions the other chickens managed to get to her when she was outside the roosters tried to do their thing and the hens started pecking at her. We were beginning to think she'd beaten whatever this is because she was doing so well just a few days ago - following us around the house like a puppy, eating like she couldn't get enough, and she seemed generally happy. Her vision has never quite recovered and there are times when she seems to have fairly good vision, then times when it seems she's seeing only large objects. Anyway, yesterday she had a total relapse; unable to stand at all, lack of appetite, general weakness. Everything I've found on her symptoms points to Marek's, but everything on Marek's says it strikes younger birds. If it is Marek's, will this go on indefinitely, the recovery and relapse? Is it cruel to let her go on? We have a little flock of nine chickens, mostly rescues, and we're attached to all of them but this girl has become such a pet. We really want to do what's best for her. We don't mind nursing her through the relapses but we don't want her suffering. I'd appreciate any thoughts on this. Thank you.