Clinical application of interferons in large animal medicine.

Interferons are efficacious therapeutic agents for treatment of several clinically important diseases in cattle and horses. In some instances, the therapeutic goal of IFN administration is prevention or clinical cure of acute viral infections. On the other hand, IFN may serve as adjunctive treatment to diminish clinical manifestations of disease and improve the quality of life. Oral administration of IFN alpha appears to be a safe and convenient route of administration, and the therapeutic benefit likely develops via unique mechanisms involving oropharyngeal-associated lymphoid tissue for dissemination and amplification of the pharmacologic response. At the time of this writing, IFN has not been approved by the USDA or the FDA for use in food-producing animals or horses.