In a consideration of the sequelae of epidemic encephalitis, the course of which is so difficult to affect by treatment, the question of prognosis is of the utmost importance. In the absence of data on former epidemics, a close observance of the progress of a series of cases offers the greatest amount of information for determining the probable outlook in any individual case.
Symonds1 writes, in 1921, that in the subacute stage of the disease a prognosis as to the probable duration and recovery must be uncertain for several months. He found no statistics available regarding the percentage of cases in which complete recovery takes place.
Since 1921 there have been many reports of the sequelae of encephalitis, and several articles deal with these features of the disease as observed in children. Paterson and Spence2 are in agreement with others in reporting the frequency of occurrence of sequelae.