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ou are correct that the vaccines are not 100 percent effective. But before dismissing the vaccines, let s consider what s meant by effective and how that has been assessed. The vaccine s effectiveness has been measured primarily in a pretty obvious way: calculating the fraction of people who contract COVID-19 after receiving the vaccine. There have been a variety of studies. Some considered only people who were symptomatic and others answered this question by looking at multiple blood tests that identified asymptomatic people. Another confounder was the time that had elapsed since the vaccine series was completed. Overall, though, studies showed that individuals who had their second vaccine at least 14 days prior have an