TY - CPAPER AU - Chang CC, Yoon KJ, Zimmerman JJ TI - Evidence that persistent porcine reproductive and respiratory syndrome virus infection in pigs does not require significant genetic change in open reading frame 5 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 - 2009 DA - 2009/11/01 L1 - https://www.aasv.org/library/swineinfo/Content/SHAP/2009/v17n6p318.pdf SE - Nov-Dec ER -