TY - CPAPER AU - Holtkamp DJ, Polson DD, Torremorell M, et al TI - Terminology for classifying swine herds by porcine reproductive and respiratory syndrome virus status T2 - Journal of Swine Health and Production DP - American Association of Swine Veterinarians DB - AASV Swine Information Library UR - https://www.aasv.org/library/swineinfo/ PY - 2011 DA - 2011/01/01 L1 - https://www.aasv.org/library/swineinfo/Content/SHAP/2011/v19n1p44.pdf SE - Jan-Feb ER -