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. 3 I$ d& \% @: x* w* T5 k; Z s& S; Q, o" Q' E
Am J Vet Res. 1998 Dec;59(12):1540-4. 8 g+ r& a, _* x/ b2 l $ b0 A# s7 C' W. ~0 e链接：http://www.ncbi.nlm.nih.gov/pubmed/9858403
发表于 2011-1-23 19:06
