Epidemic encephalitis A
Epidemic encephalitis A is also known as encephalitis lethargica. In April 1917, Dr. Constantin von Economo published his clinical and pathological findings of the disease at the Vienna Psychiatric Society and proposed that it was an independent disease, so it was also called Von Economo encephalitis. At the end of World War I, encephalitis A swept across Europe, infecting about 5 million people, most of whom were young people, and more women than men. The clinical features of the acute phase are fever, lethargy, ophthalmoplegia, and excessive chorea. The chronic phase is mainly manifested by Parkinson's syndrome.