We have had a good year with no real problems with illness in the overall flock, other than a bout with lice and the occasional "accidental" death. We have a small flock (13) of Langshan's that are about 12 weeks old. We let them out in the yard during the day and they spend the night inside the house in a very large dog crate. They have been doing this for about two or three weeks. These were birds that we hatched from shipped eggs, and we did not vaccinate them. Today one of the pullets did not come out of the crate and was just sitting there. She can walk when prompted, but her legs seem very weak. Her craw was empty, so we brought her indoors to feed and water her, she pecked the food once and then no more. I "helped" her drink and even gave her some vitamins and electrolytes in the water, but she wasn't interested herself. Her eyes are still bright, but her comb is really pale. I researched the symptoms here on BYC and the internet and it sounds like she may have Marek's Disease. It seems I should not have introduced them to the flock for a couple more months, I didn't know that. If any has any other ideas of things it might be or treatments to try, please let me know. I have not noticed any worms in the poo-but haven't wormed them either. Tips on what to use to worm the whole flock would be appreciated too. I think it is time. Thanks!