Visual Information: Impact of Vacinations

In a clear and compelling illustration, these charts of disease incidence before and after the introduction of vaccines show dramatic decline in illness from measles and polio.
Screen Shot 2015-02-20 at 9.44.31 AM

This data from Project Tycho and the Center for Disease Control shows the numbers of infected people by state and year, (at the scale is cases per 100,000 people.) When the vaccine is introduced there is a brief lag and then marked decline in cases.You can see more examples HERE, including hepatitus A, rubella, whooping cough and small pox.
Screen Shot 2015-02-20 at 9.47.44 AM

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