“…Three methods are currently accepted for early diagnosis: immunofluorescent examination (and/or virus culture) of brain tissue obtained by biopsy [MacCallum et al, 1964;Buckley and MacCallum, 19671, demonstration of a specific intrathecal immune response t o herpes simplex virus (HSV) in lumbar cerebrospinal fluid (CSF) [MacCallum et al, 1974;Klapper et al, 19811, or the detection of HSV specific glycoprotein antigen in CSF [Lakeman et al, 19871. In terms of early diagnosis, however, each of these procedures has disadvantages.…”