Do most people vaccinate for Marek's? I have 6 new pullets and am wondering if most people vaccinate? Also, I have 7 laying hens already. How old/what age is a safe time to integrate the new pullets with the laying hens? Specifically, I am asking about waiting to make sure the new pullets seem healthy, as to not infect the laying hens. Not sure if my question is clear, hopefully it is.