WHO looks into report of Covid patients testing positive after negative tests The World Health Organization (WHO) has said it is looking into reports of some Covid-19 patients testing positive again after initially testing negative for the disease while being considered for discharge. On Friday South Korean officials reported that 91 patients thought to have been cleared of the new coronavirus had tested positive again. Jeong Eun-kyeong, the director of the Korea Centers for Disease Control and Prevention, told a briefing that the virus may have been “reactivated” rather than the patients being re-infected.