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With no way to identify Omicron and Delta patients, doctors struggle with treatment decisions.

Will shortened isolation periods spread the virus?

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

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

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

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

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

Antiviral Covid Pills Are Coming. Will There Be Enough Tests?

New Virus Variant Stokes Concern but Vaccines May Still Work

Home Covid tests recalled over false positives reach 2 million kits.

The Biden administration is ‘prepared to defend’ the vaccine rules for big employers, the surgeon general says.

Has the Virus Infected Huge Numbers of Younger Children?

A maker of rapid Covid tests recalls nearly 200,000 kits over concerns of false positives.

How Accurate Are At-Home Covid Tests?

A ‘Race-Free’ Approach to Diagnosing Kidney Disease

I’m Haunted by Sisters With Sickle Cell: Two Thrived. Two Suffered.

The Pandemic Has Set Back the Fight Against H.I.V., TB and Malaria

180 cases are traced to a church camp and conference that didn’t require vaccinations or testing, the C.D.C. says.

180 cases are traced to a church camp and conference that didn’t require vaccinations or testing, the C.D.C. says.

Seeking Early Signals of Dementia in Driving and Credit Scores