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
"Measures may include screening of passengers prior to travel and/or upon arrival, and use of SARS-COV-2 testing or quarantine of international travellers after thorough risk assessment," the WHO said in its latest travel advice.
"Blanket travel bans will not prevent the international spread, and they place a heavy burden on lives and livelihoods," it said. Some 56 countries were reportedly implementing travel measures aimed at potentially delaying import of Omicron as of Nov 28, it added.