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Not really, as I said coccidiosis vaccine isn't really necessary and the mareks vaccine isn't always effective. I wouldn't worry about it.

They're too old to vaccinate now. Medicated feed only helps prevent coccidiosis, which is easy to treat. Mareks vaccine only helps (with about 85% effectiveness) to prevent the mareks tumor from growing and causing issues. Mareks vaccinated birds can still catch and spread mareks without ever...