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The complex-trapping-blocking (CTB) ELISA for detection of antibodies against classical swine fever virus (CSFV) using two monoclonal antibodies (mAbs) directed against envelope glycoprotein E2, has been improved using recombinant CSFV E2-antigen. The newly developed Ceditest ELISA for CSFV-Ab is a modification of the CTB-ELISA as described by Wensvoort et al. (1988) and Bloemraad et al. (1993)....