TY - CPAPER AU - D.J. Holtkamp; D.D. Polson; M. Torremorell TI - Standard herd classification system for describing the PRRS virus status of 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 - 2010 DA - 2010/09/01 L1 - https://www.aasv.org/library/swineinfo/Content/LEMAN/2010/044.pdf SE - Section II: Major Diseases ER -