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Blood Clots Linked to AZ Vaccine Stem From Rare Antibody Reaction

The antibodies led to a condition called thrombotic thrombocytopenia, which caused both clotting and abnormal bleeding. The researchers suggested naming the newly identified version in…

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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…

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Researchers Are Hatching a Low-Cost Covid-19 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…

View More Researchers Are Hatching a Low-Cost Covid-19 Vaccine

The Pfizer-BioNTech Vaccine Is Said to Be Powerfully Protective in Adolescents

The Pfizer-BioNTech coronavirus vaccine is extremely effective in young adolescents, perhaps even more so than in adults, the companies reported on Wednesday — a finding…

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A New Coronavirus Variant Is Spreading in New York, Researchers Report

A new form of the coronavirus is spreading rapidly in New York City, and it carries a worrisome mutation that may weaken the effectiveness of…

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Studies Suggest People Who Had Covid-19 Should Get Single Vaccine Dose

Nearly 30 million people in the United States — and probably many others whose illnesses were never diagnosed — have been infected with the coronavirus…

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