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Virus & Vaccine Trackers Coronavirus Coverage

More omicron cases pop up as world rushes to learn more

Cases of the omicron variant of the coronavirus popped up in countries on opposite sides of the world Sunday and many governments rushed to close their borders even as scientists cautioned that it's not clear if the new variant is more alarming than other versions of the virus.

New COVID-19 variant casts pall, shocks experts in South Africa

The World Health Organization has classified the omicron variant as a highly transmissible variant of concern, though its actual risks are not yet understood. Early evidence suggests it poses an increased risk that people who have already had COVID-19 could catch it again, the WHO said. It could take weeks to know if current vaccines are less effective against it.

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