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Immunology

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LONDON (AP) — Britain announced a “first tentative step” Friday toward resuming international travel, saying U.K. citizens will be able to travel to countries including Portugal, Iceland and Israel later this month without having to quarantine upon their return.

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MOSCOW (AP) — Russian authorities gave regulatory approval Thursday to a single-dose version of the country's Sputnik V vaccine, arguing that the move could accelerate the process of achieving herd immunity against the coronavirus.

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MISSION, Kan. (AP) — After more than a year of fretting over her 13-year son with a rare liver disease, Heather Ousley broke into tears when she learned that he and millions of other youngsters could soon be eligible for the COVID-19 vaccine.

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President Joe Biden predicted a return to some normalcy "by the end of the summer" on Monday, but health experts are increasingly doubtful that the United States will reach herd immunity from Covid-19.

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