A bacterium called Yersinia pestis causes the plague. It's transmitted to humans by fleas.

这场瘟疫由一种名为鼠疫杆菌的细菌引发。这种细菌通过跳蚤传染给人类。

Except for the prairie dogs that get eaten. And the Yersinia pestis bacteria that cause plague.

当然，除了被吃掉的草原犬鼠和引发鼠疫的鼠疫耶尔森氏杆菌。

The disease was brought to Europe by rodents that carried fleas with the bacillus bacterium Yersinia pestis.

这种疾病是由携带带有鼠疫杆菌的跳蚤的啮齿动物带到欧洲的。

Spyrou says the strain of Yersinia pestis that set off the Black Death is now itself extinct.

斯派尤表示，引发黑死病的鼠疫杆菌现在已经灭绝。

A bacterium called Yersinia pestis causes the plague.

一种叫做鼠疫耶尔森氏菌的细菌会引起鼠疫。

It consisted of a collection of diseases, all of which were caused  by the same bacterium, Yersinia pestis.

它由一系列疾病组成，所有这些疾病都是由同一种细菌鼠疫耶尔森氏菌引起的。

By opening up trade they also opened up vectors for disease to travel, in the case of the Plague via fleas infected with Yersinia pestis.

通过开放贸易，他们也打开了疾病传播的媒介，在鼠疫的情况下，跳蚤感染了鼠疫耶尔森氏菌。