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Once you start vaccinating for Mareks, you have to vaccinate ALL and FOREVER! Mareks vaccine is only good till one day old. After that it does not work.
Please don't give out mis information..............
Mareks vaccine is good on any young bird that has not been infected to the virus.
You do not have to vaccinate forever if you use the vaccine, it doesn't spread bird to bird. If your farm has a bad mareks virus on your property, it is a good idea to vaccinate your birds. However, the vaccine does not stop the birds from getting the virus, it stops the tumors from developing.