Abstract
Twenty-five years ago studies of the diverse etiology of viral meningitis and encephalitis were begun in the new virology laboratories at Walter Reed Army Medical Center under the leadership of the late Dr. Joseph E. Smadel. It is a tribute to this outstanding virologist that the project has been sustained at his old laboratory and has resulted in the extensive investigation of over 2000 cases of Central-nervous-system infections assumed to be of viral origin. Elsewhere in this issue of the Journal the experience of that laboratory with infections of the nervous system due to herpes-simplex virus is reviewed by Olson . . .