This what happens when you vaccinate in a society:

polio.png

If you want to know what happens when enough individuals in a society opt out of vaccination, I have some articles about the current measles outbreak I could send you...

For the people who got measles at Disneyland, out of the California victims for whom vaccination data could be verified, 82% were not vaccinated.

refs (accessed 28 Jan 15):

  • http://www.cdc.gov/vaccines/pubs/pinkbook/downloads/polio.pdf (it's their graphic which I redrew to improve clarity)
  • http://www.latimes.com/local/lanow/la-me-ln-measles-outbreak-disneyland-20150121-htmlstory.html