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  • Apoorva Mandavilli

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How The US is Getting a Crash Course in Scientific Uncertainty Due to the Pandemic

As the pandemic takes an unexpected direction, Americans again must reckon with twists in scientific understanding of the virus.

The U.S. Is Getting a Crash Course in Scientific Uncertainty

As the pandemic takes an unexpected direction, Americans again must reckon with twists in scientific understanding of the virus.

Vaccine Effectiveness Against Infection May Wane, C.D.C. Studies Find

Federal health officials said the new data justified a campaign of booster shots. But some scientists disagreed, saying not every American needs another dose.

Breakthrough Infections and the Delta Variant: What to Know

Scientific understanding of the coronavirus variant is changing quickly. Here’s a recap of the most important findings.

Vaccinated People May Spread the Virus, Though Rarely, C.D.C. Reports

The agency cited an outbreak in Provincetown, Mass., in which most of the infected were immunized. Unpublished internal documents paint an even more harrowing picture...

C.D.C. Internal Report Calls Delta Variant as Contagious as Chickenpox

Infections in vaccinated Americans are rare, compared with those in unvaccinated people, the document said. But when they occur, vaccinated people may spread the virus...

How Often Do the Vaccinated Spread Covid-19?

The C.D.C.’s new masking advice was based in part on data showing that the virus can thrive in the airways of vaccinated people. The findings...