عام 1962 حل وباء في تنزانيا اسمه "وباء الضحك" بدأ الوباء بين فتيات المدارس وانتشر في البلاد كلها، فأصابهم الضحك المستمر أيام إلى أسابيع احيانا، واضطرت الحكومة لغلق المدارس لـ6 اشهر كاملة.
Tanganyika laughter epidemic
The laughter epidemic began on January 30, 1962, at a mission-run boarding school for girls in Kashasha. It started with three girls and spread throughout the school, affecting 95 of the 159 pupils, aged 12–18. Symptoms lasted from a few hours to 16 days. The teaching staff were unaffected and reported that students were unable to concentrate on their lessons. The school closed on March 18.
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