South Korea study shows how coronavirus spreads indoors

The study — adding to a growing body of evidence on airborne transmission of the virus — highlighted how South Korea’s meticulous and often invasive contact tracing regime has enabled researchers to closely track how the virus moves through populations. “In this outbreak, the distances between infector and infected persons were ... farther than the generally accepted 2 meter [6.6-foot] droplet transmission range,” the study’s authors wrote. “The guidelines on quarantine and epidemiological investigation must be updated to reflect these factors for control and prevention of COVID-19.”