TY - CPAPER AU - M Torremorell, JO Geiger , B Thompson, WT Christianson TI - Evaluation of potential sources of PRRS virus infection in negative herds T2 - Allen D. Leman Swine Conference DP - American Association of Swine Veterinarians DB - AASV Swine Information Library UR - https://www.aasv.org/library/swineinfo/ PY - 2004 DA - 2004/09/01 L1 - https://www.aasv.org/library/swineinfo/Content/LEMAN/2004/abstracts/5_Torremorell.pdf SE - Supplement ER -