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These terms define your current search. Click the × to remove a term. Biological Sciences: immunology > immunogenetics > antigenic variation × 97 items, grouped by Farms and Farming Systems (view ungrouped items) aquaculture (1)    (Click to View) Streptococcus phocae, an emerging pathogen for salmonid culture Veterinary microbiology farms (3)    (Click to View) Evaluation of the protective efficacy of a commercial vaccine against different antigenic groups of H9N2 influenza viruses in chickens Veterinary microbiology (Click to View) The epidemic status and genetic diversity of 14 highly pathogenic porcine reproductive and respiratory syndrome virus (HP-PRRSV) isolates from China in 2009 Veterinary microbiology (Click to View) Recent Avian Influenza Virus A/H5N1 Evolution in Vaccinated and Unvaccinated Poultry from Farms in Southern Vietnam, January–March 2010 Transboundary and emerging diseases