3Lopez O J, Osorio F A. Role of neutralizing antibodies in PRRSV protective immunity[J]. Vet Immunol Immunopathol, 2004,102 : 155-163.
4Yoon K J,Wu L L. Antibody-dependent enhancement (ADE) of porcine reproductive and respiratory syndrome virus (PRRSV) infection in pigs[J]. Viral Immunol, 1996,9 : 51-63.