The number of infected people, measured over 70-some years and across all 50 states and the District of Columbia, generally declined after vaccines were introduced. The heat maps below show number of cases per 100,000 people.
![Battling Infectious Diseases in the 20th Century: The Impact of Vaccines](https://cdn-ak-scissors.b.st-hatena.com/image/square/be0bbf3bceba316e84b6e3ec4f2299f3d2518d24/height=288;version=1;width=512/http%3A%2F%2Fsi.wsj.net%2Fpublic%2Fresources%2Fimages%2FOG-AD828_VACCIN_NS_20150211161752.jpg)
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