Each day, workers at the wastewater treatment plant in New Haven, Connecticut, siphon off a bit of sewage and put it in a cooler. Then, researchers from Yale University swing by to pick it up. In their hands, that pile of refuse is a key tool to predict the trajectory of the local COVID-19 outbreak.

cely clanok:
https://www.theverge.com/21283825/sewer-systems-coronavirus-seawge-data-warning-signs-cities