What is the laughter epidemic? What was cause of mysterious 1962 Tanzania laughter epidemic? Details here

economictimes.indiatimes.com:

Kashasha, Tanganyika (now Tanzania) in 1962. Among boarding school kids, laughter rather than sickness spread. The school's three females were the first to break out into uncontrollably loud laughter on January 31st, starting the chain reaction that quickly spread to many others, as per the reports of the 'metro.co.uk'.

The spread of laughter

As the laughter went across the school, it started harmlessly enough but quickly turned disruptive. 95 out of 159 students were impacted, almost all of them, in a few weeks. As if impervious to the situation, the staff found it difficult to control it. The laughing became so loud that the school had to be closed.

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Contagious laughter

The laughter traveled throughout the country as the students went back to their homes. Hundreds, maybe even thousands, were impacted, according to differing reports. Even while the fits of laughter were harmless at first, they became a severe problem for some people, lasting weeks at a time.

Laughing continuously for more than 20 seconds can lead to fainting and respiratory issues due to disrupted breathing. Some victims experienced rashes and uncontrollable flatulence. The laughter, though uncontrollable, often left people distressed rather than amused.

The end of the epidemic

The laughing epidemic eventually abated after six to eighteen months. The fits finally stopped completely, becoming shorter and less frequent. The precise cause is still