A 33-year-old man living in Hong Kong had Covid-19 twice this year, according to preliminary research.
원문출처 : https://www.cnn.com/2020/08/24/health/covid-19-reinfection-hong-kong-study/index.html
원문출처 : https://www.cnn.com/2020/08/24/health/covid-19-reinfection-hong-kong-study/index.html