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As Covid Shots for Kids Stall, Appeals Are Aimed at Wary Parents

Yes, Omicron Is Loosening Its Hold. But the Pandemic Has Not Ended.

As Omicron Crests, Booster Shots Are Keeping Americans Out of Hospitals

A Surge in Hospitalized Young Children Infected With the Coronavirus

Will shortened isolation periods spread the virus?

Omicron is not more severe for children, despite rising hospitalizations.

Most of the World’s Vaccines Likely Won’t Prevent Infection From Omicron

As uncertainties linger about the new variant, officials say U.S. Omicron cases are likely to rise.

Omicron Variant Spreading Twice as Quickly as Delta in South Africa

Omicron Prompts Swift Reconsideration of Boosters Among Scientists

Does Omicron cause only mild illness? The jury is still out.

C.D.C. Panel Endorses Covid Vaccine Booster Shots for All Adults

First Known Covid Case Was Vendor at Wuhan Market, Scientist Claims

Has the Virus Infected Huge Numbers of Younger Children?

C.D.C. Panel Recommends Covid Booster Shots for Millions of Americans

Tuberculosis, Like Covid, Spreads in Aerosols, Scientists Report

What Scientists Know About the Risk of Breakthrough Covid Deaths

Deaths from tuberculosis rose in 2020, for the first time in a decade, the W.H.O. says.

If You’ve Had Covid, Do You Need the Vaccine?

A ‘Historical Event’: First Malaria Vaccine Approved by W.H.O.