Comparing disease heatmaps: The impact of vaccines before and after

This infographic displays heat maps for seven infectious diseases (Measles, Hepatitis A, Mumps, Pertussis, Polio, Rubella, Smallpox) across U.S. states from the 1930s to 2000s. Each map shows infection rates per 100,000 people using color-coded squares, with a vertical black line marking when the vaccine was introduced for that disease. The visual pattern consistently shows a sharp decline in infection rates after the vaccine's introduction, demonstrating the vaccines' effectiveness. The title is 'Battling Infectious Diseases in the 20th Century: The Impact of Vaccines'.

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