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From Wikipedia http://en.wikipedia.org/wiki/Marek's_disease "Vaccination is the only known method to prevent the development of tumors when chickens are infected with the virus. However, administration of vaccines does not prevent transmission of the virus, i.e., the vaccine is...

Something else to think about. Once vaccinated for Mareks, or having survived Mareks, they carry it in their system and can possibly pass that on to un-vaccinated birds. There are birds out there immune to Mareks, but I'm not going out of my way to figure out if mine are or not.