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.
원문출처 : https://www.cnn.com/2022/05/18/health/covid-wastewater-data-not-understood/index.html
원문출처 : https://www.cnn.com/2022/05/18/health/covid-wastewater-data-not-understood/index.html