- Jul 6, 2015
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I have a flock of 15 adult hens (1.5yrs old) that were vaccinated at the hatchery as chicks. I have 5 new chicks from a classroom incubator hatching project that are now 2 weeks old that will eventually join them. Should I vaccinate them for Marek's because my original flock is? It's not too late, is it? Cost is not a huge problem... just want a piece of mind that my flock won't come down with this awful disease. Thanks for any guidance.