Click on each area to see the most current positivity rates for all counties in Illinois, plus counties in the northwest region of Indiana. A positivity rate is the rate of positive cases of coronavirus, when compared to all people tested. A rate of 10.0%, for example, means that one out of every ten people tested, in the last 7 days, tested positive for coronavirus. The World Health Organization states that an area's coronavirus positivity rate should be below 5.0%. The State of Illinois begins to issue warnings for positivity rates above 8.0%.