A growing number of recovered COVID-19 patients are relapsing in South Korea, raising new questions and concerns among scientists and health authorities after the country successfully flattened the curve.
By Friday, Korean health authorities had identified 163 patients who tested positive again after a full recovery. The number more than doubled in about a week, up from 74 cases on April 9. Those patients — just over 2% of the country's 7,829 recovered patients — are now back in isolation.