Study of Booster Shot Benefits Fans Debate Over Extra Doses

Wading into an acrimonious debate over booster doses, researchers in Israel reported on Wednesday that a third dose of the Pfizer-BioNTech coronavirus vaccine can prevent both infections and severe illness in adults older than 60 for at least 12 days. The study, published in the New England Journal of Medicine, is the latest salvo in the conflict over whether booster […]

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Is the Delta Variant Making Younger Adults ‘Sicker, Quicker’?

Many doctors on the front lines say unvaccinated patients in their 20s and 30s are becoming more severely ill, and more quickly. But comprehensive data is lacking. By Roni Caryn Rabin Recently, a 28-year-old patient died of Covid-19 at CoxHealth Medical Center in Springfield, Mo. Last week, a 21-year-old college student was admitted to intensive care. Many of the patients […]

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As Infections Rise, C.D.C. Urges Some Vaccinated Americans to Wear Masks Again

In communities with growing caseloads, vaccinated and unvaccinated people should return to masking in indoor public areas, health officials said. By Apoorva Mandavilli Revising a decision made just two months ago, the Centers for Disease Control and Prevention said on Tuesday that people vaccinated against the coronavirus should resume wearing masks in public indoor spaces in parts of the country […]

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Delta Variant Widens Gulf Between ‘Two Americas’: Vaccinated and Unvaccinated

Even as many Americans celebrate the apparent waning of the pandemic, the thrum of concern over the so-called Delta variant grows steadily louder. The variant, the most contagious version yet of the coronavirus, accounts for more than half of new infections in the United States, federal health officials reported this month. The spread of the variant has prompted a vigorous […]

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Scientists Report Earliest Known Coronavirus Infections in Five U.S. States

Blood drawn from nine people in the earliest days of the pandemic tested positive for the infection. But some experts questioned the results. By Apoorva Mandavilli When did the coronavirus arrive in the United States? The first infection was confirmed on Jan. 21, 2020, in a resident of Washington State who had recently returned from Wuhan, China. Soon after, experts […]

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Scientists Report Earliest Known Coronavirus Infections in Five U.S. States

Blood drawn from nine people in the earliest days of the pandemic tested positive for the infection. But some experts questioned the results. By Apoorva Mandavilli When did the coronavirus arrive in the United States? The first infection was confirmed on Jan. 21, 2020, in a resident of Washington State who had recently returned from Wuhan, China. Soon after, experts […]

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Reaching ‘Herd Immunity’ Is Unlikely in the U.S., Experts Now Believe

Widely circulating coronavirus variants and persistent hesitancy about vaccines will keep the goal out of reach. The virus is here to stay, but vaccinating the most vulnerable may be enough to restore normalcy. By Apoorva Mandavilli Early in the pandemic, when vaccines for the coronavirus were still just a glimmer on the horizon, the term “herd immunity” came to signify […]

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Many Children With Serious Inflammatory Syndrome Had No Covid Symptoms

Pediatricians should be vigilant, experts said, after the release of the largest U.S. study of the syndrome, MIS-C, that can strike young people weeks after their coronavirus infection. By Pam Belluck Many children and teenagers who developed the mysterious inflammatory syndrome that can emerge several weeks after contracting the coronavirus never had classic Covid-19 symptoms at the time of their […]

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