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The WHO defines a “variant of concern” as any variant that either weakens the effectiveness of vaccines or increases transmissibility or virulence to a degree “of global public health significance.” Between Delta and Omicron, the WHO labeled variants like … .
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Sources 2/ https://fortune.com/2022/01/26/who-next-covid-variant-more-deadly-omicron/ The mention sources can contact us to remove/changing this article |
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