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The concern wasn’t that they’d shed virus from the vaccine itself (they can’t do that), but from a potential infection with the actual disease, since vaccinated birds can still contract and spread it, they just won’t get seriously sick or die so you may not even know they contracted it.

The virus is not transmitted via the eggs, so if the hen that laid the eggs was infected, the chick in the egg will be clean. So the chicks hatch clean. Hatchery eggs and chicks are usually kept in a separate area, so it's unlikely that the chicks that hatched clean will get it from the breeding...