In the late 1700s, a doctor in the English countryside battles to save his village from the devastation of smallpox. Then, almost by accident, he stumbles upon a perplexing mystery that helps him revolutionize medicine forever.

Follow MrBallen's Medical Mysteries on Amazon Music or wherever you get your podcasts. New episodes publish for free every Tuesday. Prime members can binge episodes 57-64 early and ad-free on Amazon Music. Wondery+ subscribers can listen ad-free--join Wondery+ in the Wondery App or on Apple Podcasts.

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