And bubonic plague, spread by rat fleas, is normally preceded by the death of hordes of rats (only then do the fleas opt for humans). Yet no one in 1348 recorded this.
黑死病由鼠蚤传播，在此之前通常都有大批的老鼠死亡(只有在这时跳蚤才选择人类作宿主)，但在1348年没有人记录下这些。
It's not mice but rat that starts plague, which crack people .
是老鼠而不是野鼠引起鼠患，这个说去引起人们发笑。
Objective: To investigate the constituent of flea species, the dominant fleas and their spatial distribution patterns in the natural epidemic focus of wild-rat type of plague in Yunnan province.
目的：调查研究云南省野鼠型自然疫源地蚤类组成、优势蚤种及其空间分布格局。
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