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. , H3 s& ^- \' z( \: x+ q; B 7 q0 A% L' ]7 zAm J Vet Res. 1998 Dec;59(12):1540-4. + }* K- s! D4 ]* j8 I |' y( e# p# R5 Y- A
链接:http://www.ncbi.nlm.nih.gov/pubmed/9858403