Global disease experts say little is known about China's experience with long-term COVID effects thought to have afflicted millions with debilitating fatigue, brain fog and other symptoms
"There is now consistent evidence that omicron is spreading significantly faster than the Delta variant," WHO director-general Tedros Adhanom Ghebreyesus told a news briefing for Geneva-based journalists, held at its new headquarters building.
"And it is more likely people vaccinated or recovered from COVID-19 could be infected or re-infected," Tedros said.