Immunotherapy trial for horses in British Columbia with Culicoides (Diptera:Ceratopogonidae) hypersensitivity.

The study revolves around the use of immunotherapy to treat horses in British Columbia suffering from a severe allergic disease caused by Culicoides – tiny biting flies. The research successfully observed reduced clinical signs in the majority of horses after the treatment, with increasing improvements in the second year.

Immunotherapy for Culicoides hypersensitivity in horses

• The research focused on Culicoides hypersensitivity, a severe, chronic, allergic disease which affects horses. The disease is caused by small biting flies of the genus Culicoides.
• The hypersensitivity leads to substantial irritation, formation of large lesions, hair loss, and even secondary infection in affected horses.
• The most commonly affected areas in horses are their ventral midline, mane, and the area proximal to their tail.

Treatment method and dosage

• Using a crude extract from Culicoides, the researchers performed immunotherapy on the horses. The extract was injected subcutaneously into affected horses.
• The test sample constituted ten horses, all of which were severely affected by the disease.
• The dosage of the extract was increased incrementally, following which the horses exhibited reduced clinical signs related to the disease.

Results and future implications

• Following weekly administration of the extract in the first year, 90% of the horses (i.e., nine out of ten) showed reduced symptoms.
• In the second year of the experiment, eight of these horses continued to receive a maintenance dose. The remaining two horses were likely excluded due to either unresponsiveness or other complications.
• At the end of the second year, three horses were completely free of clinical symptoms, three manifested significantly reduced symptoms, and two horses displayed moderate symptom reduction.
• The research goes on to discuss the dosage requirements, the frequency of the injections, and possible future applications of this immunotherapy technique. The success of the project suggests that this method could be effectively utilized to provide relief to horses suffering from Culicoides hypersensitivity.