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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