The number of infected people, measured over 70-some years and across all 50 states and the District of Columbia, drastically declined after vaccines were introduced. These maps below that show the number of cases per 100,000 people. Click the link below to check them out online as they are interactive – you can scroll over each state and get the exact case numbers. The impact of vaccinations is pretty darn impressive!
http://graphics.wsj.com/infectious-diseases-and-vaccines/
