题目：Clinical consequences of exposing pregnant gilts to strains of porcine reproductive and respiratory syndrome (PRRS) virus isolated from field cases of "atypical" PRRS./ |- ?4 T0 k# P6 i7 S
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Am J Vet Res. 1998 Dec;59(12):1540-4.. O- Q6 d& V* U
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链接：http://www.ncbi.nlm.nih.gov/pubmed/9858403
发表于 2011-1-23 19:06
