The United States ordered airlines to hand over the names of passengers from southern African countries hit by the Omicron COVID-19 variant and other countries tightened their borders as a European leader urged people to "prepare for the worst".
Air travellers to the United States will face tougher COVID-19 testing rules, while more countries tightened their borders amid uncertainty around the virulence of the Omicron variant and its ability to evade vaccine protection.
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The World Health Organisation said "blanket travel bans will not prevent the international spread, and they place a heavy burden on lives and livelihoods".