Countries around the world have been increasing anti-coronavirus measures as they try to assess the new threat.
Germany has brought forward the rollout of vaccines for children aged five to 11.
Japan and Hong Kong have said they will expand travel curbs. The US is drawing up new travel guidelines that are likely to include a negative Covid test before arrival.
Meanwhile, the World Health Organization has been holding a special session in Geneva to start work on an international accord on tackling future pandemics.
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