I do not believe any TSC chicks are vacanated. If you order directly from the hatchery they generally offer it and it's not a guarantee they won't get it. Having the vaccine limits the symptoms only.We got our first and 3rd batch of chickens from Tractor Supply. All but one has died from Marek's disease. They all got cancer. There is one still living that has tumors, but she has a stubborn will to live. We've taken them all to the vet to get treatment. Treatment has been very expensive. One question to ask Tractor Supply (or anyone selling chicks) is have they all been properly vaccinated for Marek's disease? This would involve being vaccinated, quarantined until their immunity builds up, and then only after that being available for sale. I told TSC about this, and they offered a refund for the chicks.