Why kids must be vaccinated

Doctor Edward Jenner had heard people discuss how milk maids frequently suffered from the relatively benign infection of cow pox but never seemed to get sick with smallpox.

http://www.adelaidenow.com.au/news/national/we-cant-afford-to-forget-the-lessons-of-the-past-the-time-is-right-to-have-kids-vaccinated/story-fndo1qgd-1226602943714