Methods and formulations for the treatment of infectious bursal disease in avian subjects

In one aspect, the invention relates to a method of treating infectious bursal disease (IBD) in an avian subject in need of such treatment. The method comprises administering to the subject a compound of the formulas (I) through (IV) or a pharmaceutically acceptable salt thereof in an amount sufficient to treat IBD. In another aspect, the invention relates to a method of producing active immunity against infectious bursal virus disease (IBD) in an avian subject. The method comprises administering to a subject an immunogenic-amount of an IBDV vaccine and a compound selected from the compounds of formulas (I) through (IV) described herein. The compound represented by formulas (I) through (IV) is administered in an amount sufficient to induce an immune response in the avian subject.