9 votes Korea Centers for Disease Control and Prevention releases results of investigation showing that recovered cases that re-test positive later are not infectious Posted May 20, 2020 by Deimos Tags: coronaviruses.covid19, epidemiology, south korea, testing, kcdc https://www.cdc.go.kr/board/board.es?mid=a30402000000&bid=0030&act=view&list_no=367267&nPage=1