Sorry that you are dealing with Mareks. Have you checked out "The Great Big Giant Mareks Faq" yet? It is a long but good article on about every question about Mareks. If you go to the top of this page to the search box, you will find it. Mareks is not transmitted through the egg, but the eggs would probably need to be sanitized as hatcheries do with their eggs. I don't know how to sanitize, but it may be a dilute bleach solution, but you surely could find that info somewhere online. All chickens in the flock are carriers, and the disease may last for 7 or more years in the environment. Each new chicken will become infected with the virus, but if they have had the vaccine and been kept away from the disease (chickens, dander, dust) for at least 3 weeks, they shouldn't suffer from the effects of the disease. Some threads by members with Mareks in their flocks still may have chickens get the disease, even with all of the caution. Google Mareks disease for many more articles.
