I am new to the forum and find this site extremely valuable and I am reaching out in desperation for help! I have 4 amazing silkie chicks at 10 weeks old and about 2 weeks ago(Aug 3) one of them started acting funny, not running around with the other 3 as much, laying down often etc. We let them run in the yard during the day and I am home with them so I was able to notice a slight behaviour difference right away. We are new to keeping chickens, so I didn't have any experience or knowledge of Marek's. A few days later she was limping a bit and we thought she just hurt herself, so we kept an eye on her. She slowly got worse on the leg (not bending it, jutting out in front) and last Wednesday we brough her in the house and started looking up chicken sicknesses/symptoms on the internet. I have to say that when all the signs pointed to Marek's and I read the diagnosis and lack of cure I was devistated! I got them from a breeder off of craigslist and am not sure if she vaccinates, but am assuming since my chick has contracted it, she does not vaccinate. Now I watch the rest of them continually nad am worried sick that they will also show symptoms! My question to all of you -and I DO hope that someone can help clear this confusion up for me- is that in reading all of the info on this site and others, all that I have read says that the chick needs to be vaccinated right after birth or in the egg to protect it from contracting this horrid disease. But since mine are over 2 months, and since one of them is showing signs of the lesions/tumors affecting the nerves, I KNOW the others have been exposed (though we have kept them separate after we suspected Marek's) and have only read in a few places that giving the vaccine AFTER they have been exposed is beneficial, but most sites just say vaccinate before 24 hrs old. But my confusion is where I read that giving the vaccine late will not stop them from being infected with the disease, but it WILL stop the formation of tumors. (Mareks vaccine is unique in that it does not stop a bird from becoming infected with the virus,but it stops the formation of the Tumors that are caused by the Mareks virus. By: Peter J. Brown, First State Veterinary Supply, Inc.) All the info I have read says there is no cure and to cull your infected birds, but these are not just chickens to me! They are my friends, more than friends! We have cried many a tear after reading the diagnosis on Marek's and what it can do to your flock. I have spent night after night reading about it to only feel defeated until I read the post from "kathyinmo" from May 27th about Marek's. In the post it stated by Peter J. Brown that giving the vaccine later was good for a backup booster for high risk areas and that they can be vaccinated at any age if they have not been exposed. Since mine have been exposed, would this help stop the growth of the tumors? I can't stand to see any of the other three come down with this! It hurts too much! If anyone has had any experience with this or can help clarify I would love to hear from you! Thanks SO much!