We haven't vaccinated them for mareks or coccidiosis, but we want our chicks to be healthy as well as their eggs to be as pure as possible. We will feed them all organic after they get off starter feed, but do we need to use medicated feed? Our friends neither vaccinated or used medicated feed for their chickens and they have never had a problem, but they live on a farm and our chickens would be in an urban setting. Can we start them with organic chick starter? How many people have had problems in urban settings with chickens not vaccinated or medicated?