About 20% of grocery store workers had Covid-19, and most didn't have symptoms, study found CNNCOVID-19 transmission—up in the air The LancetDementia and other cognitive disorders linked to severe Covid-19, study suggests Health24Immunity to coronavirus lingers for months, study finds CNNMore infections than reported: New study demonstrates importance of large-scale SARS-CoV-2 antibody screenings Medical XpressView Full Coverage on Google News