FacebookMail Each new infection opens the door to unknown variants which threaten to undo the progress that has been made in the fight against the pandemic. The big question is: will the existing vaccines still work? If you like this article, please sign up for Snapshot, Portside's daily summary. Email (One summary e-mail a day, you can change anytime, and Portside is always free.) Leave this field blank Science coronavirus COVID-19 vaccines Pandemic
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