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  • Apoorva Mandavilli

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Scientists Question Data Behind an Experimental Alzheimer’s Drug

Studies linked to Cassava Sciences, once a stock market favorite, have been retracted or challenged by medical journals.

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

Infections in vaccinated Americans also may be as transmissible as those in unvaccinated people, the document said, and lead more often to severe illness.

Behind the Masks, a Mystery: How Often Do the Vaccinated Spread the Virus?

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...

C.D.C. Says Some Vaccinated Americans Should Wear Masks Again

In communities with growing caseloads, vaccinated and unvaccinated people should return to masking in indoor public areas, health officials said.

The Delta Variant Is the Symptom of a Bigger Threat: Vaccine Refusal

There are almost as many reasons for vaccine hesitancy and refusal as there are unvaccinated Americans. But this problem, not the variant, lies at the...

J.&J. Vaccine May Be Less Effective Against Delta, Study Suggests

Many who received the shot may need to consider boosters, the authors said. But federal health officials do not recommend second doses.