Covid-19 variants: How do they evolve? Are boosters necessary?

by 24USATVJuly 14, 2021, 7:50 p.m. 21
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The Delta variant of Covid-19 makes up more than half of coronavirus cases in the United States since early July 2021. How did this variant evolve into what the World Health Organization calls, "the fastest and the fittest Covid variant." Will we need booster shots to fight this variant?

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