Covid-19 variants, conceptual illustration
Conceptual illustration of variants of the SARS-CoV-2 coronavirus, the cause of the Covid-19 pandemic. SARS-CoV-2 emerged in Wuhan, China, in December 2019 before spreading worldwide. Viruses are constantly changing through mutation. Some of the many new variants will persist in the population, while others will disappear., Photo by TIM VERNON / SCIENCE PHOTO LIBRARY
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