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

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Federal health officials said the new data justified a campaign of booster shots. But some scientists disagreed, saying not every American needs another dose. Tags: suchen suche search tag anzeigen besucherzahl browser design domain finger […]

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Breakthrough Infections and the Delta Variant: What to Know

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Scientific understanding of the coronavirus variant is changing quickly. Here’s a recap of the most important findings. Tags: suchen suche search tag anzeigen besucherzahl browser design domain finger inhalt jahr karpfen konto liegen materie problem […]



Covid-19 Delta Variant Widens Gulf Between Vaccinated and Unvaccinated

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Data from overseas, particularly Britain, suggest the spread of the virus will set vaccinated and unvaccinated communities on very different paths.



Should People With Immune Problems Get Third Vaccine Doses?

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France is handing out third shots of the two-dose vaccines to cancer patients and others with immune system impairments. In the United States, patients like these are on their own.



Researchers Are Hatching a Low-Cost Covid-19 Vaccine

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A new formulation entering clinical trials in Brazil, Mexico, Thailand and Vietnam could change how the world fights the pandemic.