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Marek's vaccine is like the Covid vaccine. It will help prevent serious illness and death but you can still get Covid and have mild to annoying symptoms and infect others.

It matters not the breed of either group. If the younger vaccinated chicks are to reap the full benefit of being vaccinated, they need to be kept segregated from unvaccinated birds for two weeks so they can develop the resistance to Marek's that the vaccine confers. Be aware of what is called...