Scientists have developed vaccines for Covid-19 in record time. Now how do we convince enough people to take them? To get a better understanding of the roots and causes of "vaccine hesitancy," Sarah spoke with political scientist and Watson Institute Associate Professor Prerna Singh.

In studying the history of mass vaccination, Prerna has come to a troubling conclusion: skepticism (and at times, outright rejection) is an inescapable part of modern vaccination efforts. But by looking at successful vaccination programs of the past, Prerna also explains why this kind of skepticism exists, and what can be done to overcome it.

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