10 Mysterious Illnesses That Terrified Entire Communities

From unexplained neurological symptoms to mass hysteria and ancient plagues, these outbreaks left entire communities terrified and desperate for answers. Join us as we look at bizarre medical mysteries that spread fear across the centuries, from modern-day cases still under debate to historic epidemics that changed lives forever. Our countdown includes Havana Syndrome, Kuru, the 1976 Philadelphia Legionnaires’ outbreak, the Le Roy teen tics, and more! Which of these would scare you the most? Let us know in the comments below!

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0:00 Introduction
0:27 Havana syndrome
1:42 Kuru
2:44 Legionnaires' disease
4:18 Le Roy teen tics
5:37 Sweating sickness
6:40 Nodding disease
7:49 Plague of Athens
8:51 Tanganyika laughter epidemic
9:59 Encephalitis lethargica
10:48 Dancing plague of 1518