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As case positivity rates drop to July levels, 31 more school outbreaks reported in suburbs

COVID-19 case positivity rates in the suburbs and Chicago have dropped below 4% for the first time since July 24.

The rate in some suburban counties had surpassed 6% last month, according to Illinois Department of Public Health records.

But this week also saw 31 more COVID-19 outbreaks at suburban schools, IDPH reported.

Case positivity measures the rate of new cases out of tests administered, and it often is given as a seven-day average to account for any daily anomalies and better show trends.

Chicago's seven-day case positivity rate is the lowest in the region at 2.8%, and the highest is in Will County at a little more than 3.9%.

Suburban Cook County is reporting a seven-day case positivity rate of just under 3%, while Lake County's is at 3.5%, Kane County's is at 3.7% and DuPage County's is at 3.8%.

In McHenry County - where the seven-day case positivity rate had climbed to nearly 7.8% in August - the rate is just below 3.9%, according to IDPH data.

The statewide seven-day case positivity rate is 4.06%, the first time it's been that low since July 30.

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