TY - CPAPER AU - Nigrelli, A.; G. Leotti , F. Joisel and S. Longo TI - LONG TERM PROTECTION AGAINST MYCOPLASMA HYOPNEUMONIAE BY TWO VACCINATION PROGRAMS IN PARMA’S HAM PRODUCTION SYSTEM 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 - 2004 DA - 2004/06/01 L1 - https://www.aasv.org/library/swineinfo/Content/IPVS/2004/1012.pdf SE - 1.5. Immunology and Vaccination ER -