By CBS 2 Chicago Staff

CHICAGO (CBS) — Soon you will be tested for COVID-19 and not even know it.

The Illinois Department of Public Health plans to start regular testing of sewage.

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The program will begin in 10 counties, but by the end of the year it will be rolled out to the entire state.

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Experts say they can detect the coronavirus in human waste days before symptoms appear.

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They hope testing can give officials an early warning before an outbreak.

CBS 2 Chicago Staff