should i vaccinate my existing flock for mareks before introducing my chicks?

[froggyphore]

i have four 2 year old hens and six 3-4 week old chicks that i will be introducing next month. i believe my chicks have been vaccinated against mareks because they have a small bald spot on their right shoulder, but i don't know if my hens were (though they came from the same store). should i get them vaccinated two weeks before introduction or is there no point? thanks for any advice

 

[Eggcessive]

It is too late to vaccinate your 2 year olds to protect them from Mareks, but there is no reason to vaccinate them because your new chicks are coming vaccinated. The 2 year olds will not get Mareks from the vaccinated chicks.