1 янв 1898 г. - Paul-Louis Simond (1858-1947)

Описание:

-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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