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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  Learn how to identify measles and the safe and effective vaccine that can prevent this potentially life-threatening infection for adults and children. 

County Level Prevalence Maps

The Illinois Behavioral Risk Factor Surveillance System (BRFSS) is a state-based program that gathers information on physical and mental health risk factors and conditions among Illinois adults 18 years of age and older through a telephone survey. It is the primary source of information for health departments on the behaviors and conditions related to the leading causes of death for adults in the general population.

Illinois conducts the Illinois County Behavioral Risk Factor Surveys (ICBRFS) in individual counties over the course of 3-4 years in what is referred to as county rounds. County round 5 is the latest county-level data to be released. The following ten topics were completed for each county during the round and impact chronic disease prevention and control: