Hi I wrote in with a problem with a sick chicken (buff orpington)last week and have subsequently found out that it had Marek's disese from the breeder. He quickly put the chicken to sleep and replaced it with another. Now the replacement chicken has the same symptoms and I am going to have to take it back tomorrow. I'm concerned about my other 5 hens, all under 25 weeks. Can they catch it? So far they are all fine and dandy but I'd appreciate it anyone could give me some advice. Many thanks.