上游充通大学 Shanghai Jiao Tong University Pathogens-harmful microorganisms Time:1350 A.D.Place:the European continent. "In less than two years'time,the Bubonic Plague wiped out half the population of Europe.Fleas bit rats and then bit man, but no one knew it.An estimated 25 million people died in 14 months.Some individual cities had a mortality as high as 90%. Bodies were piled into carts and dragged away to be burned in common graves.It was a most grotesque way to die:bleeding and screaming and having one's organs literally liquefy.From infection to death took perhaps one week. 1350年黑死病流行于欧洲，2500万人在14个月内死亡。 Bubonic Plague.黑死病，淋巴腺鼠疫 Chen Feng,Shanghai Jiao Tong UniversityShanghai Jiao Tong University Chen Feng, Shanghai Jiao Tong University Pathogens-harmful microorganisms Time: 1350 A.D. Place: the European continent. “In less than two years' time, the Bubonic Plague wiped out half the population of Europe. Fleas bit rats and then bit man, but no one knew it. An estimated 25 million people died in 14 months. Some individual cities had a mortality as high as 90%. Bodies were piled into carts and dragged away to be burned in common graves. It was a most grotesque way to die: bleeding and screaming and having one's organs literally liquefy. From infection to death took perhaps one week. ” 1350年黑死病流行于欧洲，2500万人在14个月内死亡。 Bubonic Plague黑死病, 淋巴腺鼠疫