In South Korea, health officials are trying to solve a mystery: why 163 people who recovered from coronavirus have retested positive, according to the Korea Centers for Disease Control and Prevention (KCDC).
원문출처 : https://www.cnn.com/2020/04/17/health/south-korea-coronavirus-retesting-positive-intl-hnk/index.html
원문출처 : https://www.cnn.com/2020/04/17/health/south-korea-coronavirus-retesting-positive-intl-hnk/index.html