Healthcare workers register people who will receive a dose of Covid-19 vaccine, at the vaccination centre of Parque das Nacoes in Lisbon on December 1, 2021.

Video. WHO 'confident' current COVID-19 vaccines will work against Omicron

"We have very effective vaccines that have proven to be effective against all variants so far, in terms of severity of disease and hospitalisation, and there is no reason to think that this would not be the case with Omicron," said WHO emergency manager.

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