Clínic Barcelona
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What do we know about Omicron? the variant that is causing millions of infections

The Omicron variant that appeared in South Africa in November 2021 displaced the Delta variant in 3-4 weeks in over 100 countries and now represents 90% of the new coronavirus infections.

Omicron has the highest transmission rate of all the previous variants. It has a higher replication in the upper respiratory tract; nasal passages and pharynx, which increases infectivity but reduces severity and hospitalization.

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