FILE PHOTO: A South Korean patient affected with the coronavirus disease (COVID-19) casts her ballot for the parliamentary election at a polling station set up at a quarantine center in Yongin, South Korea, April 11, 2020. REUTERS/Kim Hong-Ji/File Photo
The World Health Organization (WHO) said on Saturday that it was looking into reports of some COVID-19 patients testing positive again after initially testing negative for the disease while being considered for discharge.