Testing people may not be the best way to see how much coronavirus is in a community. Testing sewers may be better.

New Castle County, Delaware is analyzing its sewers in a high-tech way to track the amount of coronavirus in the county.

An analysis made by BioBot, a startup connected to MIT, estimates more than 15,000 COVID-19 infections as of April 15, 10 times what conventional tests confirmed.

BioBot looks for traces of the virus in wastewater.

The company was founded by female scientists at MIT.

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"You can get tests from different substations. You can then say, 'OK, these are where our top three hotspots are, and we should focus our testing there,'" he adds.