5Annette M,et al.Characterisation of PCV2 isolate from Spain,Germany and France [J].Virus Res,2000,66:65~67.
6Nishizawa T,et al.A novel DNA virus(TTV)associated with elevated transaminase levels in posttransfusion hepatitis of unkown etiology [J].Biochem Biophys Res Commun,1997,241:92~97.
7Clark E G.Post-weaning multisystemic wasting syndrome [J].Proc Am Assoc Swine Pract,1997,28:499~501.
8Wensvoort G, Terpstra C, Pol JM, et al. Mystery swine disease in the Netherlands: the isolation of Lelystad vilus [J]. Vet Q, 1991,13 (3) :121 - 130.
9Collins JE, Benfield DA, Christianson WT, et al. Isolation of swine infertility and respiratory syndrome virus (isolate ATCC VR - 2332) in North America and experimental reproduction of disease in gnotobiotic pigs[J] .J Vet Diagn Invest, 1992,4(2):117- 126.
10Kranker S, Nielsen J, Bille - Hansen V, et al. Experimental incculation of swine at various stages of gestation with a Danish isolate of porcine reproductive and respiratory syndrome vims(PRRSV)[J]. Vet Microbiol, 1998,61( 1 - 2) :21 - 31.
4Lyoo KS,Park YH,Park BK.Prevalence of porcine reproductive and respiratory syndrome virus, porcine circovirus type 2 and porcine parvovirus from aborted fetuses and pigs with respiratory problems in KoreaJournal of Veterinary Science,2001.
5Wellenberg G J,Stockhofe-Zurwieden N,Boersma W J,et al.The presence of co-infections in pigs with clinical signs of PMWS in The Netherlands:a case-control studyResearch in Veterinary Science,2004.