Fig. 4. Specificity of the immunochromatographic strip test. Positive sera of porcine reproductive and respiratory syndrome virus (PRRSV), porcine circovirus-1 (PCV-1), pseudorabies virus (PRV), classical swine fever virus (CSFV), porcine parvovirus (PPV), porcine circovirus-2 (PCV-2), and PRRSV-negative sera were tested by using the immunochromatographic strip at the same time. Result positivity can be decided by visual judgment.