TY - CPAPER AU - Tianning Yang TI - Keeping the negative status of a farm infected with variant PRV with combination a live and inactivated Bartha strain vaccines T2 - International Pig Veterinary Society Congress DP - American Association of Swine Veterinarians DB - AASV Swine Information Library UR - https://www.aasv.org/library/swineinfo/ PY - 2018 DA - 2018/06/11 L1 - https://www.aasv.org/library/swineinfo/Content/IPVS/2018/Poster (0263-1000)/0579-Yang_T.pdf SE - Virology & Viral Diseases (poster) ER -