“…The VZV etiology was established by different methods, ie, antigen detection in lymphocytes of the cerebrospinal fluid (CSF) [Peters et al, 19791, complement fixation, or indirect membrane immunofluorescence in serum and/or CSF [Easton, 1970;Gershon et al, 1980;Vilchez-Padilla et al, 19821 or detection of specific oligoclonal antibodies in CSF [Vartdal et al, 19821. The search for virus-specific antibodies in CSF through highly sensitive serological techniques may be applied to the etiological diagnosis of central nervous system (CNS) infections. These methods have been utilized both for the investigation of subacute and chronic neurological processes such as subacute sclerosing panencephalitis (SSPE) or multiple sclerosis [Salmi et al, 1972;Norrby et al, 1974;Kiessling et al, 1977;Nordal et al, 1978;Arnadottir et al, 1982;Vartdal and Vandvik, 19831 and in acute infections, such as mumps meningitis [Friden et al, 1978;Morishima et al, 1980;Ukkonen et al, 19811, encephalitis and ascending myelitis due to herpes simplex virus (HSV) [Lerner et al, 1972;Levine et al, 1978;Kosluniemi and Vaheri, 1982;Kosluniemi et al, 19821, encephalitis, meningoencephalitis encephalomyelitis caused by VZV [Gershon et al, 1980;Vartdal et al, 1982;Andiman et al, 19821, or arbovirus encephalitis [Hoffman et al, 1979;Burke et al, 19821. As far as acute viral infections are concerned, the diagnosis is based on the demonstration that specific antibodies are produced intrathecally .…”