I have all the chicks that I buy from hatcheries vaccinated against Marek's disease, not coccidiosis. The chicks raised here aren't vaccinated against Marek's, and after many years, it hasn't appeared here. I'm paranoid about biosecurity, and blessed to have no near neighbors with diseased birds. May it continue! If Marek's disease appears here, my unvaccinated birds will be the 'canaries in the coal mine' and show issues. Other vaccines are for commercial flocks or birds that attend poultry shows, not typical backyard flocks. Mary
