Omicron Prompts Swift Reconsideration of Boosters Among Scientists

As recently as last week, many public health experts were fiercely opposed to the Biden administration’s campaign to roll out booster shots of the coronavirus vaccines to all American adults. There was little scientific evidence to support extra doses for most people, the researchers said. The Omicron variant has changed all that. Scientists do not […]

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What We Know About the New Covid Variant, Omicron

What is the Omicron variant? First identified in Botswana and South Africa, this new iteration of the coronavirus has prompted concern among scientists and public health officials because of an unusually high number of mutations that have the potential to make the virus more transmissible and less susceptible to existing vaccines. The World Health Organization […]

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A Cure for Type 1 Diabetes? For One Man, It Seems to Have Worked.

Brian Shelton’s life was ruled by Type 1 diabetes. When his blood sugar plummeted, he would lose consciousness without warning. He crashed his motorcycle into a wall. He passed out in a customer’s yard while delivering mail. Following that episode, his supervisor told him to retire, after a quarter century in the Postal Service. He […]

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C.D.C. Recommends Covid Booster Shots for Millions of Americans

In a sweeping victory for the Biden administration, the Centers for Disease Control and Prevention on Thursday endorsed booster shots of the Moderna and the Johnson & Johnson Covid-19 vaccines for tens of millions of Americans. The decision follows an agency endorsement last month of booster shots of the Pfizer-BioNTech vaccine and opens the door […]

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What Scientists Know About the Risk of Breakthrough Covid Deaths

The death of former Secretary of State Colin Powell on Monday from complications of Covid-19 has provided fuel for vaccine skeptics and opponents, who immediately seized on the news that Mr. Powell had been vaccinated to stoke doubts about the effectiveness of the vaccines. But Mr. Powell’s immune system had quite likely been weakened by […]

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Moderna vs. Pfizer: Both Knockouts, but One Seems to Have the Edge

It was a constant refrain from federal health officials after the coronavirus vaccines were authorized: These shots are all equally effective. That has turned out not to be true. Roughly 221 million doses of the Pfizer-BioNTech vaccine have been dispensed thus far in the United States, compared with about 150 million doses of Moderna’s vaccine. […]

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Breakthrough Infections and the Delta Variant: What to Know

In some rare cases, breakthrough infections may lead to persistent symptoms. “Long Covid” is a poorly understood set of symptoms that can plague people for several months after an active infection has ended. While those symptoms eventually resolve in many patients, “there are this subset of people who have long Covid who just aren’t able […]

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Covid Is Especially Risky for People With H.I.V., Large Study Finds

“H.I.V. knocks out all the brakes on the immune system, and as a consequence you get this inflammatory response that’s robust and sustained — and now you got Covid on top of that,” said Dr. Steven Deeks, an H.I.V. expert at the University of California, San Francisco. “I would be surprised if H.I.V. was not […]

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Should People With Immune Problems Get Third Vaccine Doses?

When it came to coronavirus vaccination, the third time was the charm for Esther Jones, a dialysis nurse in rural Oregon. After two doses of the Pfizer-BioNTech vaccine failed to jolt her immune system into producing antibodies, she sought out a third, this time the Moderna shot. It worked. Blood tests revealed a reasonable antibody […]

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¿Se puede tomar alcohol después de la vacuna para la covid?

Los ensayos clínicos de las vacunas para la covid que actualmente están aprobadas para su uso por la Administración de Alimentos y Medicamentos (FDA por su sigla en inglés) no analizaron específicamente si el alcohol tenía algún impacto en la eficacia de las vacunas, dijo Hewlett. Es posible que haya más información al respecto en […]

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Researchers Are Hatching a Low-Cost Coronavirus Vaccine

A new vaccine for Covid-19 that is entering clinical trials in Brazil, Mexico, Thailand and Vietnam could change how the world fights the pandemic. The vaccine, called NVD-HXP-S, is the first in clinical trials to use a new molecular design that is widely expected to create more potent antibodies than the current generation of vaccines. […]

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Getting One Vaccine Is Good. How About Mix-and-Match?

In January, Britain made a change to its vaccine guidelines that shocked many health experts: If the second dose of one vaccine wasn’t available, patients could be given a different one. The new rule was based on sheer guesswork; there was no scientific data at the time demonstrating that mixing two coronavirus vaccines was safe […]

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