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the vaccine have is a two part (powder & liquid) after a portion is mixed try to use it within a few hours. The parts can be kept separate for a while in the fridge. See package. Yes you can give boosters. That is a good way to use the "left overs" from when you vaccinate chicks, if too much...

Continued debate is fine, but the vaccine is inexpensive and the risk is not worth taking with my flock. The information below is from Wikipedia. Please read the green sentences that say it spreads by dander and that newer vaccines are a combination of turkey and chicken marek's. I still...

so since you will have some now vaccinated you need to get your entire flock vaccinated to be safe.

from what I understand...if any of your chick have been vaccinated for Marek's, they are protected but they are now carriers of the dormant virus. They will "shed" it and you increase the risk to your flock members who are not vaccinated. The breeder I first bought from believed in...