COVID-19 vaccines in the age of the delta variant

The clinical development and global rollout of highly effective vaccines against SARS-CoV-2 has been unprecedentedly rapid. Nevertheless, viral evolution has continued at pace to the extent that questions are being raised about the continued effectiveness of first-generation vaccines in the face of variants of concern (VOCs). In particular, the rise of the delta variant (B.1.617.2) to become the…

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