IDPH: McHenry County sees increase in COVID-19 cases, positivity rate

Lake County also goes up in cases, positivity rate

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According to the Illinois Department of Public Health's county level COVID-19 risk metrics, McHenry County had an increase in COVID-19 cases and positivity rate for the last week reported. The county now has shown an increase in cases in each of the past four weeks.

McHenry County had 75 new cases per 100,000 people for the week of July 19 to 25, up from 64 new cases per 100,000 people for the week of July 12 to 18, and a 5.4% positivity rate, up from 4.8%.

The first week that the state released county risk metrics (the week of June 14-20), McHenry County had 21 new cases per 100,000 people and a 4.3% positivity rate.

Any county with 50 or more cases per 100,000 people is showing signs of increased COVID-19 risk, according to the state's metrics. A county enters a warning level when two or more COVID-19 risk indicators that measure the amount of COVID-19 increase. The state's threshold for positivity rate is set at 8%.

On Friday, the IDPH reported that 11 counties – Cass, Gallatin, Jackson, Jo Daviess, Johnson, Perry, Randolph, Saline, Sangamon, St. Clair and White – had each entered a warning level for COVID-19.

According to the IDPH, the 11 counties saw outbreaks associated with high school graduation ceremonies, a rise in cases among late teens and 20s, parties and social gatherings, people going to bars, long-term care outbreaks, clusters of cases associated with restaurants and churches and big sports events including soccer, golf and softball tournaments.

There were four COVID-19-related deaths in McHenry County for the week of July 19 to 25, down from five deaths announced in each of the previous two weeks. There were 4,186 tests performed in the county, up 34 from the previous week and the most since the state released county risk metrics.

McHenry County had a decrease in hospital admissions, from 20 to 12.

Neighboring Lake County had 90 cases per 100,000 people, a 5.0% positivity rate, six deaths and 13,778 tests performed. The cases and positivity rate represents a significant increase after Lake County had 63 cases per 100,000 people and a 3.4% positivity rate for the week of July 12 to 18.

The state also measures the number of emergency department visits for COVID-19-like illness per county. That metric stayed stable in McHenry County at 2.9%. Visits are counted if a patient presents with a fever and either a cough, difficulty breathing or is given a diagnosis of COVID-19.

The IDPH first started reporting county level COVID-19 risk metrics June 25 to measure the health burden of COVID-19 in each Illinois county and capture a county’s ability to respond. The county metrics are presented as weekly values – based on Sunday to Saturday of the week.

The complete county level COVID-19 risk metrics can be found at

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