A thin‐layer counter current line absorption immunoelectrophoresis (TL‐CCLAIE) assay was developed for the analysis of antigens and antibodies to Aleutian disease virus. The TL‐CCLAIE assay is a rapid and sensitive assay employing 0.4 mm gels cast in moulds in order to allow technicians not routinely engaged in electrophoretic work to perform the assay. Thin gels allow a higher voltage and thus higher electrophoretic mobility of the antigens, making it possible to perform the complete assay within 2 h.