29 mar 1800 año - Puerperal Fever Discovered
Descripción:
 First identified in 18th century and Ignaz Semmelweis began hand washing in 1847. Thanks to his experimentation by disinfecting before operating on pregnant women saved them from puerperal fever. 
Añadido al timeline:
fecha:
29 mar 1800 año
Ahora mismo
 ~ 225 years ago