According to previous investigations, mild Borna disease virus encephalitis may underlie a subgroup of affective or schizophrenic type psychoses. And virus-induced immune pathology may underlie even a larger subgroup of psychoses. We treated BDV seropositive patients suffering from therapy resistant schizophrenic or affective spectrum psychoses by cerebrospinal fluid filtration (CSFF) in an experimental add-on treatment. CSFF was shown previously to be an effective immune modulatory treatment in autoimmune neurological disease, Guillain-Barré syndrome. CSFF appears to be an effective treatment in therapy resistant psychosis also, but only 4 patients were treated yet.

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