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Measles cases are on the rise globally and here in Illinois the number is increasing as well. Vaccines are 97% effective in preventing this highly contagious disease.  To learn more about this infection and get information on vaccination, go to https://dph.illinois.gov/topics-services/diseases-and-conditions/diseases-a-z-list/measles.html.  Learn how to identify measles and the safe and effective vaccine that can prevent this potentially life-threatening infection for adults and children. 

Illinois Population Data

Total Population of Illinois, Chicago, and Illinois Counties: 1950-2020

State/City/County 1950 1960 1970 1980 1990 2000 2010 2020

Source: U. S. Department of Commerce, Census 2020 Redistricting Data (Public Law 94-171)

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