Cul o 2 specific IgG3/5 antibodies predicted Culicoides hypersensitivity in a group imported Icelandic horses.
Authors: Raza Fahad, Ivanek Renata, Freer Heather, Reiche Dania, Rose Horst, Torsteinsdóttir Sigurbjörg, Svansson Vilhjálmur, Björnsdóttir Sigríður, Wagner Bettina
Journal: BMC veterinary research
Summary
# Editorial Summary Culicoides hypersensitivity develops when horses are exposed to midge salivary allergens, yet Icelandic horses—which lack endemic Culicoides populations—show heightened susceptibility to the condition upon export and first exposure as adults, suggesting age at initial exposure and prior sensitisation shape disease risk. Researchers tracked imported Icelandic horses longitudinally, collecting serum samples at multiple timepoints to identify immunological markers predictive of clinical hypersensitivity development. Elevated IgG3/5 antibodies specific to *Culicoides* saliva (Cul o 2 antigen) were identified as reliable predictors of subsequent hypersensitivity, with horses developing these antibodies at detectable levels before clinical signs manifested. These findings establish a practical serological screening tool to identify at-risk horses early—particularly relevant when importing Icelandic or other naïve populations to endemic regions—allowing preventive management strategies such as stable design modifications, insect repellents, or pharmaceutical interventions to be implemented before disease onset. The work underscores the protective effect of early-life Culicoides exposure and provides equine practitioners with an objective immunological marker to stratify hypersensitivity risk in imported stock.
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Practical Takeaways
- •Use Cul o 2 specific IgG3/5 antibody testing to identify Icelandic horses at high risk of developing midge allergies before clinical signs appear
- •Recognize that horses imported to Culicoides-endemic regions as adults face significantly higher hypersensitivity risk than those exposed from youth
- •Consider preventive management strategies for imported horses with positive predictive antibody profiles, particularly Icelandic animals
Key Findings
- •Cul o 2 specific IgG3/5 antibodies are predictive biomarkers for Culicoides hypersensitivity development in Icelandic horses
- •Adult horses first exposed to Culicoides are more susceptible to developing hypersensitivity than horses with early-life exposure
- •A longitudinal allergy model was established to identify serological predictors of CH in naive horse populations