Science
COVID vaccines slash viral spread – but Delta is an unknown – Nature.com
Studies show that vaccines reduce the spread of SARS-CoV-2 by more than 80%, but the Delta variant is creating fresh uncertainty….

A dose of the Pfizer-BioNTech COVID-19 vaccine is administered at the Sheba Medical Center near Tel Aviv, Israel.Credit: Jack Guez/AFP/Getty
Many vaccines have been shown to provide strong protection against COVID-19. Now growing evidence finds that they…
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