26 giug 1721 anni - Dr. Zabdiel Boylston of the Harvard University School of Medicine begins the first public inoculation campaign in order to slow the smallpox epidemic in Boston, giving a vaccine to his own son, and then to his slave and the slave's infant son
Aggiunto al nastro di tempo:
Data:
26 giug 1721 anni
Adesso
~ 304 years ago