Viruses, variation, and vaccines - March, 2021
More than 15% percent of the U.S. is now at least partially vaccinated against COVID-19. But at the same time, new SARS-CoV-2 strains are spreading, leading to a burning question: are our vaccines effective against those new strains? Will we all need another shot for the new viral varieties in 6 months? And then again in a year? And so on indefinitely? As we face down a future that almost certainly means learning to coexist with virus in some way, it’s worth asking a big-picture question: why do some vaccines successfully beat back a disease year after year and others do not?
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