Worldwide transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent of the ongoing Coronavirus disease 2019 (COVID-19) pandemic, has ultimately led to the ...
One dose of vaccine is not enough to protect against the Delta and Beta variants, new research suggests, and even people who have had Covid-19 should be immunized. By Apoorva Mandavilli The Delta ...
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