Children can carry coronavirus in their noses and throats for weeks even if they don't show any symptoms, which might explain how the virus can spread silently, researchers in South Korea reported Friday. "In this case series study, inapparent infections in children may have been associated with silent COVID-19 transmission in the community," the researchers wrote in a new study. … "In this study, the authors estimate that 85 infected children (93%) would have been missed using a testing strategy focused on testing of symptomatic patients alone," they wrote.