<i>childhood diseases decreased 90% between 1850 and 1940, paralleling improved sanitation and hygienic practices, well before mandatory vaccination programs</i><p>The polio vaccine's first mass vaccination campaign was in 1955, take a look at what happened to the incidence of polio: <a href="http://www.post-polio.org/ir-usa.html" rel="nofollow">http://www.post-polio.org/ir-usa.html</a><p>A measles vaccine became available in 1963. Take a look at what happened to the incidence of (or more importantly the deaths caused by) measles here: <a href="http://www.iayork.com/MysteryRays/2009/09/02/measles-deaths-pre-vaccine/" rel="nofollow">http://www.iayork.com/MysteryRays/2009/09/02/measles-deaths-...</a><p>You are spreading misinformation, you should do the research first.