Thank you Dylan for leaving a review for the Marek's vaccinations. We offer Marek's vaccinations for all baby chicks. Marek's disease is the #1 disease-related killer of chickens. It can cause paralysis, blindness and death in up to 80% of an infected flock. There is no cure for a flock once it has been infected; the only way to prevent the disease is to vaccinate for it within 24 hours of the chick hatching.