@CNN: The spread of the plague during the Black Death that killed millions was fueled by humans, not rodents, as previously believed, a new study has found https://t.co/MlGHJq65io https://t.co/cHQXyxIKLK

@CNN: The spread of the plague during the Black Death that killed millions was fueled by humans, not rodents, as previously believed, a new study has found https://t.co/MlGHJq65io https://t.co/cHQXyxIKLK