A mysterious disease swept the world in the early 1920s that put people into catatonic states; stiff and immovable like human statues. It was called encephalitis lethargica and it affected over 5 million people worldwide, and then was almost forgotten.
Knowing what we know now, what do you suppose caused this?
Vaccines released in the 20's:
1921 – First vaccine for tuberculosis by Albert Calmette[9][10]
1923 – First vaccine for diphtheria by Gaston Ramon, Emil von Behring and Kitasato Shibasaburō 1924 – First vaccine for scarlet fever by George F. Dick and Gladys Dick 1924 – First inactive vaccine for tetanus (tetanus toxoid, TT) by Gaston Ramon, C. Zoeller and P. Descombey 1926 – First vaccine for pertussis (whooping cough) by Leila Denmark