Fig. (4) The PRRSV epitope incorporated in HVR7 of hexon is accessible in the context of an intact virion. In the assay, varying amounts of purified viruses were immobilized in the wells of ELISA plate and incubated with anti-peptide antibody. The binding was detected with an AP-conjugated secondary antibody. Values are expressed as the mean and standard deviation. * indicates a P value of < 0.05.