Some activists say that Biden’s new plan for donating vaccines is not enough.

When President Biden announced in June that the United States would buy 500 million Pfizer-BioNTech coronavirus vaccine doses for poorer nations, there was a gaping hole in his plan: To fund it, the administration quietly diverted hundreds of millions of dollars that had already been promised to countries for helping to get shots into people’s arms. Mr. Biden did not […]

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More Than 80 Percent of Seniors Are Vaccinated. That’s ‘Not Safe Enough.’

Dr. Won Lee began her initial visit to a new homebound patient, Almeta Trotter, last month by asking about her life, her health and how she was managing in her apartment in Dorchester, Mass., shared with her longtime partner and a parakeet. Eventually Dr. Lee, the medical director of the Geriatrics Home Care Program at Boston Medical Center, raised a […]

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Heart Problem More Common After Covid-19 Than After Vaccination, Study Finds

The Pfizer-BioNTech Covid-19 vaccine is associated with an increased risk of myocarditis, an inflammation of the heart muscle, a large new study from Israel confirms. But the side effect remains rare, and Covid-19 is more likely to cause myocarditis than the vaccine is, scientists reported on Wednesday. The research, which is based on the electronic health records of about two […]

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More Hospitals Are Requiring Workers to Get Covid Vaccines

With some health care workers still refusing to be immunized, medical centers around the country are requiring shots as cases climb once again. By Reed Abelson More and more hospitals and major health systems are requiring employees to get the Covid-19 vaccine, citing rising caseloads fueled by the Delta variant and stubbornly low vaccination rates in their communities and even […]

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Delta, as expected, is now the dominant virus variant in the U.S., the C.D.C. estimates.

By Emily Anthes The highly contagious Delta variant of the coronavirus is now the dominant variant in the United States, according to new estimates from the Centers for Disease Control and Prevention. The agency calculates that Delta accounts for 51.7 percent of coronavirus infections. As expected by health officials, Delta, which was first identified in India, has rapidly overtaken Alpha, […]

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Mixing Pfizer and AstraZeneca vaccines provides strong protection, according to a preliminary study.

By Carl Zimmer Early results from a British vaccine study suggest that mixing different brands of vaccines can provoke a protective immune response against Covid-19. In the trial, volunteers produced high levels of antibodies and immune cells after getting one dose of the Pfizer-BioNTech vaccine and one dose of the AstraZeneca-Oxford shot. Administering the vaccines in either order is likely […]

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Reports of Severe Covid or Death After Vaccination Are Rare, but Not Unexpected

No vaccine is ever 100 percent effective, experts say, stressing that the shots remain critical in reducing severe disease and death from the coronavirus. By Emily Anthes Over the last few months, a steady drumbeat of headlines has highlighted the astounding real-world effectiveness of the Covid-19 vaccines, especially the mRNA vaccines made by Pfizer-BioNTech and Moderna. The vaccines, study after […]

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A Multibillion-Dollar Plan to End Polio, and Soon

A global partnership announced plans to spend more than $5 billion to eradicate poliovirus. By Apoorva Mandavilli As the world adjusts to the idea of coexisting with the coronavirus for the foreseeable future, global health organizations are laying plans to eradicate another scourge that has already lingered for thousands of years: poliovirus. The Global Polio Eradication Initiative, a public-private partnership […]

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AstraZeneca Vaccine Carries Slightly Higher Risk of Bleeding Disorders, Study Shows

People receiving the Covid vaccine made by Oxford-AstraZeneca had a slightly increased risk of a bleeding disorder, and possibly other rare blood problems, researchers reported on Wednesday. The findings, from a study of 2.53 million adults in Scotland who received their first doses of either the AstraZeneca vaccine or the one made by Pfizer-BioNTech, were published in the journal Nature […]

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