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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