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It was the Bubonic plague carried by rats and transfered by flees to humans, it killed 25-50 million people in the Byzantine Empire
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A disease that striked in Eurasia, that killed 100-200 million people, that formed dark spots in the armpits and groin.
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It Killed 33 million people all around the world, this disease impacted young people from the age of 20 to 40