But WHO stressed on Thursday that even a mild COVID-19 infection can result in long term health implications.
Dr Maria van Kerkhove, WHO's COVID-19 technical lead, listed extreme fatigue, shortness of breath, and difficulty resuming normal activity as some of the longer-term effects people who had a mild infection can experience.
WHO's executive director of health emergencies programme, Michael Ryan, also cited evidence of prolonged inflammatory changes to patients' cardiovascular system.
He added that little is still known about the longer-term implications of the virus.
"Why take the chance? Why take the risk?" he asked. "Don't take a risk that you cannot quantify."