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Scientists say Omicron may peak in the U.S. in mid-January but still may overwhelm hospitals.

Decision Looms That Could Determine Fate of Alzheimer’s Drug

Studies Suggest Why Omicron Is Less Severe: It Spares the Lungs

J&J’s booster shot provides strong protection against severe disease from Omicron, a study says.

Weekly Health Quiz: New Year’s Parties, Heart Health and a Common Eye Problem

As Omicron Spreads, Officials Ponder What It Means to Be ‘Fully Vaccinated’

Will shortened isolation periods spread the virus?

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

Why Older Women Face Greater Financial Hardship Than Older Men

Hospitals are scrambling as antibody treatments fail against Omicron.

A Popular Test Claims to Boost I.V.F. Success. The Science Is Unclear.

Moderna says its booster significantly raises the level of antibodies to thwart Omicron.

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

A Popular Test Claims to Boost I.V.F. Success. The Science Is Unclear.

The C.D.C. recommends that other vaccines be preferred over J.&J.

A C.D.C. panel weighs the risks of blood clots linked to the J.&J. vaccine.

The C.D.C.’s first coronavirus tests were contaminated and poorly designed, the agency says.

C.D.C. Virus Tests Were Contaminated and Poorly Designed, Agency Says

British studies warn of Omicron’s speed, and one notes the need for boosters.

In Chicago, a New Approach to Gay and Bisexual Men With Prostate Cancer

Women Earn $2 Million Less Than Men in Their Careers as Doctors

The Pandemic Has Your Blood Pressure Rising? You’re Not Alone.

J.&J. booster works well for people who had Pfizer originally, study finds.

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 and Vaccine Protection

Cognitive Rehab: One Patient’s Painstaking Path Through Long Covid Therapy

Most Covid Vaccines Will Work as Boosters, Study Suggests

Why Hasn’t the U.S. Found More Omicron Cases?

What Can One Life Tell Us About the Battle Against H.I.V.?

Omicron Prompts Swift Reconsideration of Boosters Among Scientists

The first Omicron case has been detected in the U.S.

The C.D.C. tells airlines to identify passengers who had recently been in southern Africa.