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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Mol+Psychiatry 2001 ; 6 (3): 329-33 Nephropedia Template TP
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Low avidity of human serum antibodies for Borna disease virus antigens questions their diagnostic value #MMPMID11326304
Allmang U; Hofer M; Herzog S; Bechter K; Staeheli P
Mol Psychiatry 2001[May]; 6 (3): 329-33 PMID11326304show ga
Borna disease virus (BDV) can induce neurological disease in animals. Since viral nucleic acid, infectious particles and antibodies recognizing BDV antigens were found at higher frequencies in psychiatric patients than in healthy controls, BDV is suspected to cause psychiatric disorders in humans. However, the human origin of these viruses has recently been questioned. To diagnose BDV infections, sera are usually analyzed for antiviral antibodies by indirect immunofluorescence (IFA) on virus-infected cells. This study reveals that the reactive antibodies in human sera mainly recognized the BDV phosphoprotein, whereas animal sera preferentially detected the viral nucleoprotein. Immunoglobulin (Ig) G in sera of experimentally or naturally infected animals bound to the viral antigen with high avidity, ie resisting 3 M urea, whereas reactive IgG in human sera did not. Longitudinal studies showed that reactive human antibodies persisted for many years without gaining high avidity for BDV antigens, indicating that they were probably not induced by BDV but rather by infection with an antigenically related microorganism of unknown identity or by exposure to other related immunogens.