A study of hundreds of thousands of people across England suggests immunity to the coronavirus is gradually wearing off - at least according to one measure.
원문출처 : https://www.cnn.com/2020/10/26/health/covid-19-immunity-wanes-large-study-finds/index.html
원문출처 : https://www.cnn.com/2020/10/26/health/covid-19-immunity-wanes-large-study-finds/index.html