Well I figured mine were going to die if I didn't give it to them so I had nothing to lose. I had one bird who I thought for sure was going to die but several weeks after the vaccine she not only was still living but started laying eggs too! Like I said though, we already have Marek's on our property so all new birds are kept in sanitized brooders well away from the infected area until they're much older and they're vaccinated before they ever get here.
My understanding is the vaccine will not keep them from contracting the virus but it does keep the lesions from growing in most cases. Vaccinating your birds is a race to see which virus will get hold first, the turkey one that keeps the lesions from growing or the more virulent strain that will sicken and kill the birds. This is why it's important to vaccinate as soon as possible, they have a better chance of building the good immunity. Many people will hatch out baby chicks over a period of several weeks and vaccinate them all at once. This means they have birds of varying ages and stages of development.
Only you can decide if you're willing to risk it with yours. It's a tough position to be in.
My understanding is the vaccine will not keep them from contracting the virus but it does keep the lesions from growing in most cases. Vaccinating your birds is a race to see which virus will get hold first, the turkey one that keeps the lesions from growing or the more virulent strain that will sicken and kill the birds. This is why it's important to vaccinate as soon as possible, they have a better chance of building the good immunity. Many people will hatch out baby chicks over a period of several weeks and vaccinate them all at once. This means they have birds of varying ages and stages of development.
Only you can decide if you're willing to risk it with yours. It's a tough position to be in.