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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Childhood Colds Do Not Prevent Coronavirus Infection, Study Finds

The theory was simple and compelling: Children are less vulnerable to the new coronavirus because they carry antibodies to other common coronaviruses that cause the common cold. The idea might also explain why some people infected with the new virus have mild symptoms while others — presumably without antibodies to common cold coronaviruses — are much more severely affected. The […]

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