Welcome to Some Sunday Context, where we bring you new conversations and archival episodes to provide some context on the stories playing out in the news today. This week, we just wrapped up our two-part series on early vaccine skeptics from the 1890s through the 1920s. We discussed how a lot of the skepticism began to fade away in mid-century, in part because of the success of vaccines. Perhaps the biggest win was the arrival of the polio vaccine in 1954. So, today, as we see a return of vaccine skepticism -- even within the CDC itself -- we bring you an epsiode we did in 2021 about the development of the polio vaccine in 1954.

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