Prognosis

Should I Be Worried About Covid — Again?

New Covid variant cases, wastewater samples cause concern 

A commuter boards a BART train in San Francisco on March 4. 

Photographer: David Paul Morris/Bloomberg
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Covid cases are dropping in the U.S. and mask mandates are being repealed all over. Yet over a third of the wastewater sample sites across the U.S. showed rising Covid-19 levels in the first 10 days of March. So is Covid going away or not?

For the experts, there are quite a few reasons to believe Americans shouldn’t let their guards down just yet. “The world has decided Covid is over for some reason — and that really worries me,” said Akiko Iwasaki, a professor of immunobiology at Yale School of Medicine. “Lifting all of these mandates so quickly is asking for trouble.”