00:00between 1915 and 1926 there was a pandemic that swept across the world it was called encephalitis
00:10lethargica more often referred to as sleepy sickness as the most notable symptom was emotionless
00:15state in its victims some were described as statue-like where the afflicted individuals
00:20could not speak with some even entering a coma-like state experts estimate that at least a million
00:26people contracted the disease during its height with around 500 000 dying from the illness yet one
00:32day the sleepy sickness disappeared and to this day experts are still searching for the cause
00:37however recent research is attempting to divine how it all happened as understanding past pandemics can
00:42better prepare us for future ones previous studies have attempted to link encephalitis lethargica to
00:47other illnesses especially considering it arose around the same time as the spanish flu however
00:52experts now say it might more likely be linked to our body's own autoimmune processes they found
00:58that nearly half of all of those who are afflicted with sleepy sickness may have also had autoimmune
01:02encephalitis they add that while the infections don't fit patterns we see today it could be a lead
01:07meaning the true cause of encephalitis lethargica will remain a mystery for a little while longer
01:13mer can be a mystery for a little while longer
01:18and one more color
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