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Most Americans have been infected with the coronavirus at least once, the C.D.C. says.

The Drive to Vaccinate the World Against Covid Is Losing Steam

Mask Ruling Underscores Deep Split in Attitudes

The Drive to Vaccinate the World Against Covid Is Losing Steam

India Is Stalling the W.H.O.’s Efforts to Make Global Covid Death Toll Public

A New Covid Breath Test Holds Promise, but Wide Use May Still Be Far Off

Why a Coronavirus-Flu ‘Twindemic’ May Never Happen

U.S. nursing home deaths appear to be at pandemic lows.

Covid Vaccines Did Not Protect Adolescents as Effectively During the Omicron Surge

Ivermectin Does Not Reduce Risk of Covid Hospitalization, Large Study Finds

Pfizer and Moderna boosters help protect Americans who received J.&J. shots, the C.D.C. reports.

The use of at-home coronavirus tests jumped during the Omicron wave, but disparities remain, a survey suggests.

Trying to Solve a Covid Mystery: Africa’s Low Death Rates

Alcohol-Related Deaths Spiked During the Pandemic, a Study Shows

Hong Kong’s high death rate shows the importance of vaccinating the elderly.

‘He Goes Where the Fire Is’: A Virus Hunter in the Wuhan Market

A funding dispute with G.O.P. senators may complicate Biden’s efforts on antivirals and tests.

How the Coronavirus Steals the Sense of Smell

Vaccine protection against moderate illness waned among adolescents, new C.D.C. data suggest.