12 mai 1854 - Germ Theory
Description:
Snow demonstrates that cholera bacteria is transmitted through contaminated drinking water. His "Grand Experiment" is when he compared two water companies supplying the same neighborhood. One water company moved to a fresh water site while the other remained in a polluted water site. He found out that the company with the polluted water site attained a lot more cholera deaths.(from https://www.ph.ucla.edu/epi/snow/grand_experiment.html)
Ajouté au bande de temps:
Date:
12 mai 1854
Maintenaint
~ Il y a 171 ans