Are Covid Cases Going Back Up? Sewer Data Has Potential Warning

A wastewater network that monitors for Covid-19 trends is warning that cases are once again rising in many parts of the U.S., according to an analysis of Centers for Disease Control and Prevention data by Bloomberg. More than a third of the CDC’s wastewater sample sites across the U.S. showed rising Covid-19 trends in the period ending March 1 to March 10, though reported cases have stayed near a recent low. The number of sites with rising signals of Covid-19 cases is nearly twice what it was during the Feb. 1 to Feb. 10 period, when the wave of omicron-variant cases was fading rapidly. It’s not clear how many new infections the signs in the sewage represent and if they will turn into a new wave, or will be just a brief bump on the way down from the last one. In many parts of the country, people are returning back to offices and mask rules have been loosened — factors that can raise transmission.