![With at-home tests now outnumbering those done in laboratories](https://kesq.b-cdn.net/2022/05/hypatia-h_c0b3845f08fb1acbd2ff4265b5dad0b5-h_41994585d90448164e0d3adc501017dc-300-375x225.jpg)
Covid-19 wastewater surveillance is promising tool, but critical challenges remain
By Deidre McPhillips, CNN Covid-19 surveillance is at a crossroads in the United States. With at-home tests now outnumbering those done in laboratories, official case counts are more incomplete than ever as the nation — and world — faces down increasingly transmissible coronavirus variants. Wastewater surveillance is poised to fill in the gaps and help
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