What we know about the SARS-CoV-2 Delta variant

The Delta variant is likely to become the most dominant strain globally. What does that mean for current and future variants? Natural selection has shaped the evolution of all living things on our planet, including viruses. While mutations emerge in viruses, some mutations have little impact while others outcompete other variants and persist, such as the SARS-CoV-2 variant, Delta—classified a variant of concern (VOC) by the World Health Organization (WHO).

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