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http://en.wikipedia.org/wiki/Black_Death This disease started in 1348 and ended in 1350 (In Europe) Killing 75-200 Million People
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http://en.wikipedia.org/wiki/Girolamo_Fracastoro He was the man that in 1546 had a hypothesis that epidemic diseases where caused by seed-like entities given by direct and indirect infections
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This is the timespan of the germ theory
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http://en.wikipedia.org/wiki/Germ_theory_of_disease#Miasma_theory It was a theory that diseases where caused by microorganisms that went through your blood stream
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This was suppost to be the reason that this noxous air cloud was the reason that people got diseases http://en.wikipedia.org/wiki/Miasma_theory' >Miasma Theory</a>
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http://en.wikipedia.org/wiki/Agostino_Bassi This man was the first person to prove that diseases where caused by microorganisms when he did this experiment between 1808-1813 that showed that a ''vegitable parasite'' caused a disease that formed calcinaccio.
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http://en.wikipedia.org/wiki/Ignaz_Semmelweis This doctor was working at Vienna General Hospital in 1847 when he noticed that children where dieing just after birth because of some sicknesses and what he found out was that he and other doctors needed to wash there hands with
chlorinated lime water and it reduced the deaths of babies from 18% to 2.2% at his hospital -
http://en.wikipedia.org/wiki/John_Snow_(physician) Wrote some essays on the germ theory
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http://en.wikipedia.org/wiki/Louis_Pasteur He was the second to last man to do experiments on the germ theory.
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http://en.wikipedia.org/wiki/Robert_Koch He was the last to finallize the Germ Theory
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http://en.wikipedia.org/wiki/Cholera This was a disease back centuries ago but still is infecting 3-5 million people world wide and killed 100,000–130,000 people as of 2010
