Immunology special issue Immunological reagents: catalysts for research progress General Article : A new modified live equine influenza virus vaccine: phenotypic stability, restricted spread and efficacy against heterologous virus challenge Efficacy of a cold-adapted, intranasal, equine influenza vaccine: challenge trials Passive transfer of maternal immunoglobulin isotype antibodies against tetanus and influenza and their effect on the response of foals to vaccination The mucosal humoral immune response of the horse to infective challenge and vaccination with Equine herpesvirus-1 antigens Altered immune responses to a heterologous protein in ponies with heavy gastrointestinal parasite burdens Exercise alters the immune response to equine influenza virus and increases susceptibility to infection Opsonic capacity of foal serum for the two neonatal pathogens Escherichia coli and Actinobacillus equuli Neutrophil functions and serum IgG in growing foals Evaluation of IgG concentration and IgG subisotypes in foals with complete or partial failure of passive transfer after administration of intravenous serum or plasma An immunodeficiency in Fell ponies: a preliminary study into cellular responses Production of biologically active equine interleukin 12 through expression of p35, p40 and single chain IL-12 in mammalian and baculovirus expression systems Immunoglobulin-E-bearing cells in skin biopsies of horses with insect bite hypersensitivity Detection of IgG and IgE serum antibodies to Culicoides salivary gland antigens in horses with insect dermal hypersensitivity (sweet itch) Influence of environmental and genetic factors on allergen-specific immunoglobulin-E levels in sera from Lipizzan horses Transforming growth factor beta concentrations and interferon gamma responses in cerebrospinal fluid of horses with equine protozoal myeloencephalitis Short Communication : Lymphocyte responses and immunophenotypes in horses with Sarcocystis neurona infection Equine neutrophils express mRNA for tumour necrosis factor-α, interleukin (IL)-1β, IL-6, IL-8, macrophage-inflammatory-protein-2 but not for IL-4, IL-5 and interferon-γ Adequacy of a concentrated equine serum product in preventing failure of immune passive transfer in neonatal foals: preliminary study