B117, the SARS CoV-2 variant that was first detected in the U.K., has been found to be 30%-80% more transmissible. Juan Gaertner/Science Photo Library via Getty Images

What you need to know about the new COVID‑19 variants

A biologist who studies the evolution of diseases explains what’s different about the two new virus strains that have been found recently, and what that means for vaccine effectiveness.

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