Vaccination is used in commercial poultry flocks to control disease which would otherwise devastate the laying flocks throughout the World.
Only vaccinate a few birds and the vaccine will leak and protect the other chickens.

If chicks have been vaccinated against coccidiosis, a non-medicated chick starter feed can be provided. But the vaccine does not prevent them from spreading Marek’s to unvaccinated birds.
… Commercial flocks are therefore protected as a matter of course for the key poultry diseases during their rearing period, the time before they get to the laying farm. Chickens vaccinated against Marek’s disease rarely get sick. Because coccidiosis and Marek’s Disease can impact chicks at a very early age, the vaccinations should be provided at the hatchery in the first few days of life.


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