26 nov 2021 anni - WHO classifies Omicron as a Variant of Concern.

Descrizione:

First identified in South Africa on November 24, 2021, Omicron quickly began outpacing other variants and spreading across the globe.

By November 30, Omicron was classified a Variant of Concern in the United States.

https://www.who.int/news/item/26-11-2021-classification-of-omicron-(b.1.1.529)-sars-cov-2-variant-of-concern

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