The medical term for the condition known as Saint Vitus' dance is Sydenham chorea. The condition presents symptoms such as uncontrollable jerky movements, loss of emotional control, loss of fine motor skills and symptoms of rheumatic fever.
To test for the disease, doctors may choose to run different kinds of blood tests, especially when rheumatic fever is suspected. Pre-pubescent girls are most at risk for the disease although it does affect boys in this age group according to Medline Plus.
In order to treat Sydenham chorea, the bacteria responsible for causing the rheumatic fever must be killed using strong antibiotics and often, preventative antibiotics will be issued to prevent the fever from returning.