(EN) A diagnostic means and method of detecting the presence or the absence of severe acute respiratory syndrome coronavirus antibody in a test sample. The means comprises a solid support, an unlabeled recombinant antigen peptide on a first area of the solid support, a labeled recombinant antigen peptide on a second area of the solid support and an internal control antibody peptide on a third area of the solid phase. The first area is located between the second and the third area.