New study suggests human fleas and lice were behind Black Death, not rodents

A team of researchers with the University of Oslo has found evidence that suggests human fleas and lice, not rodents, were behind the spread of the plague that killed millions of people over the course of several centuries. In their paper published in Proceedings of the National Academy of Sciences, the group reports using mathematical models from mortality records to demonstrate how the plague would have spread under different scenarios and what they found by doing so.

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