TY - CPAPER AU - TI - EFFECT OF NATURAL EXPOSURE TO VACCINE-DERIVED NORTH AMERICAN GENOTYPE PRRS VIRUS ON THE SEROLOGICAL RESPONSE IN NAÏVE PIGS 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 - 2008 DA - 2008/06/01 L1 - https://www.aasv.org/library/swineinfo/Content/IPVS/2008/oral/OR.01.69.pdf SE - Viral Diseases - PRRS ER -