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Optic neuritis: Local synthesis in the central nervous system of oligoclonal antibodies to measles, mumps, rubella, and herpes simplex viruses

Antibodies to measles, mumps, rubella and herpes simplex type 1 viruses in serum and CSF of 10 patients with acute monosymptomatic optic neuritis were characterized by imprint electro‐immunofixation (IEIF). Comparisons of the IEIF antibody patterns in serum and CSF indicated that a local synthesis in the central nervous system of oligoclonal virus antibodies took place in five of the 10 patients. Three of the five patients had a local synthesis of antibody to more than one type of virus. Oligoclonal IgG was detected by agarose electrophoresis of the CSF in four of the five patients with a local synthesis of virus antibodies. There was, however, no association between the locally synthesized antibodies and the oligoclonal CSF IgG, indicating that they account for only a minor fraction of the locally synthesized IgG in these patients. In the fifth patient, distinct fractions of locally synthesized virus‐specific oligoclonal Ig were detected by the IEIF method, although the agarose electrophoresis showed a normal pattern of CSF IgG.