22 dic 1857 año - Pasteur wanted
to establish 
cause of inf-
ectious diseases
Descripción:
 concluded anthrax caused by bacteria after working with anthrax
continued work on disease; found that chickens injected with "useless" cultures developed immunity and used this method with anthrax 
Añadido al timeline:
fecha:
22 dic 1857 año
Ahora mismo
 ~ 167 years ago