I'm not really sure if my Production Red pullet has Marek's. I wrote a post about 2-3 weeks ago about how she has always acted weird since we got her as a day old chick. She is 13 weeks old now and still the exact same...Alittle off balance, can't jump to roost high, dull feathers. (although her new ones coming in look way better) And she eats and drinks wonderfully. I don't think she has Marek's but I guess it could still be a possibility. My question is, if a chicken has Marek's, how long does it take for the disease to eventually kill the bird?