1962: Adolescent girls at a boarding school in the Bukoba district of Tanganyika suddenly began to laugh and cry. No apparent reason; they just started. At first, only three girls were affected; soon, 95 of the 159 pupils had succumbed, forcing the school to close. Back in their home villages, the girls’ abnormal behaviour spread to other children and to adults. Before the epidemic subsided, hundreds were affected.
Source: The Central African Journal of Medicine, May 1963