来自《耶鲁大学开放课程：1600年后西方社会的流行病 第6集 第6集》
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and for our purposes we can afford to ignore it.由于这不是课程的重点因此可以忽略它 -
It was of minor impact and now, like Variola major,类天花影响甚微 和典型天花一样 -
it's extinct as well.它已经灭绝了 -
Now, one question is, what's a virus?那么问题是 什么是病毒 -
We talked about the term microbe;我们之前讲过微生物 -
microbe being a generic term for microscopic organisms,微生物是显微镜下可见的生命体的总称 -
including bacteria, like our friend Yersinia pestis,包括细菌 如我们熟知的鼠疫杆菌 -
the causative agent of bubonic plague,即腺鼠疫的病原体 -
and viruses like Variola major and Variola minor,还包括像典型天花和类天花这些病毒 -
the pathogens that cause smallpox.它们是天花的病原体 -
Plague was caused by bacteria, and those,瘟疫是由细菌造成的 -
as you know--你们已经了解