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Happy Birthday, Omicron

Why Omicron Might Stick Around

Two new versions of Omicron are gaining ground in the U.S., according to C.D.C. estimates.

Black adults were hospitalized at higher rates than whites during the U.S. Omicron wave.

Charting an Omicron Infection

Fauci warns against complacency amid data that Omicron causes milder illness

What It Takes to Understand a Variant

The Coronavirus in a Tiny Drop