5 Nodelijk G, Wensvoort G, Kroese B,et al. Cbmparison of acommercial HL1SA and an immumperoxidase momlayer assayto detect antibodies directed against porcine respiratory andreproductive syndrome virus[J].J Vet 1Vficrobiol,1996,49 (3一4):285一295.
[3]
6 Dea S,Wilson L,Therrien D,et al. Detection of antibodies tothe nucleocapsid protein of PRRS virus by a competitiveHL1SA[J].Adv Exp Med Biol,2001,494:401一405.
[4]
7 Seuberlich T,Tratschin J D,Thur B,et al. Nucleocapsid pro-teiirbased enzyme-linked immunosorbent assay for detectionand differentiation of antibodies against European and NorthAmerican porcine reproductive and respiratory syndrome virus[J].Clin Diagn Lab lmmunol,2002,9 (6):1183一1191.
10 Suarez P, 7ardoya R, Prieto C,et al. Direct detection of theporcine reproductive and respiratory syndrome (PRRS) virus by reverse polymerase chain reaction (RT PCR) [J].Arch Virol,1994,135 (1一2):89一99.
[8]
11 Christopher Hennings J,Nelson E A, Nines R J,et al. Per sistence of porcine reproductive and respiratory syndrome virus in serum and semen of adult boars[J]. J Vet Diagn In-vest,1995,7 (4):456一464.
[9]
12 Itono Y,Kanm T,Shimizu M,et al. Nested PCR for detec-lion and typing of porcine reproductive and respiratory syn- drome (PRRS) virus in pigs [J].J Vet Med Sci,1996, 58 (10):941一946.
[10]
13 Elii C, Zhur B,Liu L,et al. Quantitative TaqMan RT PCRfor the detection and differentiation of European and NorthAmerican strains of porcine reproductive and respiratory syn- drome virus[J].J VirolMethods,2001,98(1):63一75.
[11]
1 Yoon IJ,10o H S,Christianson W T, et al. An indirect fluo-rescent antibogitest for the detection of antibody to swine in-fertility and respiratory syndrome virus in swine sera[J].J VetDiagn Lnvest,1992,4 (2):144-147.
[12]
2 Albina E,Leforban Y,Baron T, et al. An HI,1SA for the de-tectionof antibodies to PRRSV[J].Ann Rech Vet,1992,23(2):167一176.