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MARK LENNIHAN/POOL/AFP/Getty Both Pfizer and Moderna s new COVID-19 vaccines were found to be more than 94% effective at preventing symptomatic infections in clinical trials of tens of thousands of volunteers around the world. Each has been issued an Emergency Use Authorization by the Food and Drug Administration, kicking off what s set to be the largest vaccination campaign in US history. But what s perhaps most remarkable about them is that they were each developed in just days, using groundbreaking messenger RNA (mRNA) vaccine technology. But, she persevered anyway, spending decades refining the virus-fighting technique. When people are saying, There is no messenger RNA vaccine that s ever been, it is very critical and very important to know that not because it failed, Karikó said. It just didn t have time to be advanced by many people. ....