4LIU Y H,HAN CH,WANG F L,et al.Location of highly pathogenic porcine reproductive virus in tissues of natural cases[J].Agricul Sci Technol,2009,10(2):20-25.
6BAUSTISTA E M, MEULENBERG J J, CHOI C S, et al. Structural polypetides of the American(VR-2332) strain of porine epidemic abortion and resniratorv virus [J]. Arch Viral, 1996,141 : 1357 - 1365.
7BENFIELD D,HARRIS L,NELSON E,et al. prope tries of SIRS vires isolate ATCC VR-2332 in the united states and preliminary characterization of a monoantibody to tiffs vires[J]. Am Assoc Swine Pract Newsletter,1992,4 (4) :19 -21.
8POL J M, DUK J E, WENSVOORT G, et al. Pathological, utrastructural, and immunohistochemical changes caused by Lelystad virus in experimentally induced infections of mystery swine disease (synonym:porcine epidemic abortion and respiratory syndrm(PEARS) ) [ J ]. Vet, 1991,13 : 137 - 143.
9GORCYCA D E, SCHLESINGER K, CHLADEK D, et al. A summary of experimental and field studies evaluating the safety and efficacy of Resp PRRS/Repro for the control of PRRS-induced reproductive disease [J].Vet, 199'5,11:102 - 107.
10LOPEZ O J,OSORIO F A. Veterinary immunology and immtmopathology [ J ]. Vet Diagn Invest,2004,102 : 155 - 163.
