In 1962 a giggle at a Tanzanian girls' school became an 18-month epidemic that forced 14 schools to close and swept up a thousand people. Doctors found nothing physically wrong with any of them.
It began on January 30, 1962 with three pupils at a mission school in Kashasha and spread to 95 of 159 students, then to whole villages — fits of laughing and crying lasting hours to days.
A walk through the timeline: how the outbreak jumped from the school to the surrounding region and refused to die down for a year and a half.
A medical historian argues the 'mass hysteria' verdict said more about colonial-era psychiatry — which cast colonized peoples as irrational — than about what actually happened.
Christian Hempelmann's academic study reframes the outbreak as a motor-variant case of mass psychogenic illness, triggered by the stress of a newly independent country and strict schooling.
Real physical symptoms with no physical cause, spreading through a tight-knit group under stress — the mechanism behind fainting outbreaks, phantom smells and 'contagious' twitching.
Strasbourg, 1518: dozens, then hundreds danced in the streets for weeks, some until they collapsed. The closest historical cousin to the laughing epidemic, 444 years earlier.