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C.D.C. Considers Ending 5-Day Isolation Period for Covid

U.S. Health Officials Push Back on Idea of New Virus in China

For These Bird Flu Researchers, Work Is a Day at the Very ‘Icky’ Beach

Why a Coronavirus-Flu ‘Twindemic’ May Never Happen

An undiscovered coronavirus? The mystery of the ‘Russian flu.’

‘People Need to Be Reminded About Flu’

The C.D.C. urges flu shots to ease strain on pandemic-stretched hospitals.

It’s Time to Get a Flu Shot

A study finds no signs of trouble in getting flu and Covid shots at the same time.

New York Turns to Smart Thermometers for Disease Detection in Schools

Covid hospitalizations are rare among children, but still more frequent than for flu, the C.D.C. says.

Is It Covid or the Flu? New Combo Tests Can Find Out.

Can Covid Research Help Solve the Mysteries of Other Viruses?

Virus Variants Threaten to Draw Out the Pandemic, Scientists Say

The Pandemic and the Limits of Science

The Pandemic and the Limits of Science

Emerging Coronavirus Variants May Pose Challenges to Vaccines

The Coronavirus Is Mutating. What Does That Mean for Us?

Fears of a ‘Twindemic’ Recede as Flu Lies Low

Here’s Why Vaccinated People Still Need to Wear a Mask