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Subacute sclerosing panencephalitis and multiple sclerosis: in vitro measles immunity and sensitization to myelin basic protein.

Three children with subacute sclerosing panencephalitis (SSPE), 12 patients with multiple sclerosis (MS) and 12 healthy persons were studied by the macrophage migration inhibition factor (MIF) assay with measles and rubella antigens and with myelin basic protein. For the SSPE patients the mean migration indexes +/- standard deviation were 44.1 +/- 10.9 for measles antigen, 38.7 +/- 12.3 for rubella antigen and 49.8 +/- 25.7 for myelin basic protein; for the MS patients the indexes were 103.0 +/- 10.6, 93.8 +/- 15.0 and 89.3 +/- 19.9; and for the healthy subjects the indexes were 68.8 +/- 22.6, 77.7 +/- 31.3 and 100.1 +/- 6.5. The results of this study showed increased cellular immunity to measles and rubella in SSPE patients as compared with healthy persons, and absence of immunity to measles in MS patients. Patients with MS showed hypersensitivity to myelin basic protein during clinical exacerbations that was not associated with changes in immunity to measles, whereas all SSPE patients showed a significant response regardless to stage of illness.