<human>:  How many people died during the Black Death?
<bot>: It’s estimated that anywhere from 30 million to 100 million people died in the Black death. The plague killed people from all walks of life, and was especially devastating in the cities. The Black death was caused by a bacterium called Yersinia pestis, which is a type of bacteria that is spread by fleas. The Black death was the first pandemic in recorded history.