About 20% of grocery store workers had Covid-19, and most didn't have symptoms, study found CNNCovid toes could last for 150 days, new research finds NBC NewsThis is Why Fewer People are Dying From Coronavirus Yahoo LifestyleU.K. study: Severe COVID-19 cases may age brain by 10 years SFGateAbout 1 in 6 fully recovered COVID-19 patients still test positive for the virus Study FindsView Full Coverage on Google News