Hello everyone, I want to raise chicks this spring to add to my flock. However I’m concerned because I lost a hen to marek’s disease this past summer. I currently have a small flock, three hens and a rooster. I rushed into them a little and got them from an unknown source (lesson learned). So my whole flock was exposed to the marek’s. Is it safe for me to add new birds to my flock? If the chicks are vaccinated will they be protected? Thanks!