Health Topics

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.

Related contents