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In this Friday, July 17, 2020 file photo, health care workers take information from people in line at a walk-up COVID-19 testing site during the coronavirus pandemic in Miami Beach, Fla. (AP Photo / Lynne Sladky)

After struggling to ramp up coronavirus testing, the U.S. can now screen several million people daily, thanks to a growing supply of rapid tests. But the boom comes with a new challenge: keeping track of the results.

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(AP Illustration / Peter Hamlin)

The goal of contact tracing is to alert people who may have been exposed to someone with the coronavirus, and prevent them from spreading it to others. But the process isn’t easy. 

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(WTTW News)

Who can get a test? Where can you get one? And how much do tests costs? Here’s what you need to know about coronavirus testing in Illinois.

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(WTTW News)

U.S. Sen. Dick Durbin is raising concerns about coronavirus testing at the nation’s schools, colleges and universities in the wake of incidents in which he says the federal government “commandeered” supplies.

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(WTTW News)

Chicago health officials will continue to recommend that anyone exposed to someone diagnosed with the coronavirus be tested for COVID-19, despite new guidance from the CDC that ignited a firestorm of controversy.

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(WTTW News)

Chicago officials have begun using the state’s method to calculate the single most important benchmark for tracking the spread of the coronavirus — positivity rates — as confirmed cases of the virus continue to rise statewide.

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(WTTW News)

Illinois and Chicago officials disagree on how to calculate the single most important benchmark for tracking the spread of the coronavirus, even as the number of confirmed cases of the virus continues to rise statewide.

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(WTTW News)

Saturday marks the state’s fourth consecutive day in which more than 1,000 new cases of COVID-19 were confirmed. After falling below 1,000 new cases per day from June 6 to July 8, this month has so far seen seven days above 1,000.

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Chicagoans try to beat the heat along the lakefront trail in early July. (WTTW News)

Even if you practice safe habits, there’s always a chance you’ll come into contact with someone who has COVID-19. There’s no guarantee you’ll get it too, but there’s also no guarantee you won’t. So what then?

New statewide totals: 153,916 cases, 7,187 deaths

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(WTTW News)

As Illinois nears the 2 million mark in total COVID-19 tests conducted since the start of the pandemic, health officials reported an additional 954 cases of the virus on Sunday — and a record number of specimens tested in a single day.

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New statewide COVID-19 totals: 149,432 cases, 7,099 deaths

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(WTTW News)

A dozen new mobile testing teams will offer drive-thru and walk-up services across the state, free of charge.

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In this Sunday, June 7, 2020, photo, Elbin Sales, second from left, poses for a photograph with his wife, Yecenia Solorzano, right, and children Jordi Sales, left, and Athena Sales, amid the new coronavirus pandemic in Immokalee, Fla. (AP Photo / Lynne Sladky)

As the pandemic explodes in diverse states like Arizona and Florida, people in communities of color who have been exposed to the virus are struggling to get tested. 

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(Courtesy of the Office of Gov. J.B. Pritzker)

The Pritzker administration says the federal government has promised Illinois 600,000 swabs to be used in COVID-19 tests. But this week, Illinois got what appeared to be 23,000 cotton baby swabs — and officials aren’t sure they can be used.