1 jan 1898 ano - Paul-Louis Simond (1858-1947)
Descrição:
-French army physician working with Pasteur
-Used scientific method to show the connection between plague, Yersinia pestis, fleas and rodents
-Used infected rat in cage below a healthy rat in cage and was able to show that the fleas that jumped from infected rat jumped to healthy rat and infected in thus showing transmission
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