Peasants left their plows, mechanics their shops, servants their masters, children their homes; and beggars and idle vagabonds, who understood how to imitate the convulsions, roved from place to place, inducing all sorts of crime and vice among the afflicted. Strasburg was visited by the dancing plague in 1418, and it was here that the plague assumed the name of St. Vitus's dance. St. Vitus was a Sicilian youth who, just at the time he was about to undergo martyrdom by order of Diocletian, in the year 303, is said to have prayed to God that He might protect all those who would solemnize the day of his commemoration and fast upon its eve. The people were taught that a voice from heaven was then heard saying, "Vitus, thy prayer is accepted."Paracelsus called this malady (Chorus sancti viti) the lascivious dance, and says that persons stricken with it were helpless until relieved by either recovery or death. The malady spread rapidly through France and Holland, and before the close of the century was introduced into England. In his "Anatomy of Melancholy"Burton refers to it, and speaks of the idiosyncrasies of the individuals afflicted. It is said they could not abide one in red clothes, and that they loved music above all things, and also that the magistrates in Germany hired musicians to give them music, and provided them with sturdy companions to dance with.
Their endurance was marvelous. Plater speaks of a woman in Basle whom he saw, that danced for a month. In Strasburg many of them ate nothing for days and nights until their mania subsided.
Paracelsus, in the beginning of the sixteenth century, was the first to make a study of this disease. He outlined the severest treatment for it, and boasted that he cured many of the victims.
Hecker conjectures that probably the wild revels of St. John's day, 1374, gave rise to this mental plague, which thenceforth visited so many thousands with incurable aberrations of mind and disgusting distortions of the body. Almost simultaneous with the dance of "St. With," there appeared in Italy and Arabia a mania very similar in character which was called "tarantism," which was supposed to originate in the bite of the tarantula. The only effective remedy was music in some form. In the Tigre country, Abyssinia, this disease appeared under the name of "Tigretier."The disease, fortunately, rapidly declined, and very little of it seems to have been known in the sixteenth century, but in the early part of the eighteenth century a peculiar sect called the "Convulsionnaires" arose in France; and throughout England among the Methodist sect, insane convulsions of this nature were witnessed; and even to the present day in some of the primitive religious meetings of our people, something not unlike this mania of the Middle Ages is perpetuated.
Paracelsus divided the sufferers of St. Vitus's dance into three classes .--(1) Those in which the affliction arose from imagination (chorea imaginativa).
(2) Those which had their origin in sexual desires depending on the will.
(3) Those arising from corporeal causes (chorea naturalis). This last case, according to a strange notion of his own he explained by maintaining that in certain vessels which are susceptible of an internal pruriency, and thence produced laughter, the blood is set into commotion in consequence of an alteration in the vital spirits, whereby are occasioned involuntary fits of intoxicating joy, and a propensity to dance. The great physician Sydenham gave the first accurate description of what is to-day called chorea, and hence the disease has been named "Sydenham's chorea." So true to life was his portrayal of the disease that it has never been surpassed by modern observers.