Abstract: A polymeric device and method for the control of insects on animals is disclosed. The device is in the form of an ear tag or other shape which can be attached to an animal using known techniques. A unique polymer/insecticidal formulation is provided by combining an ectoparasiticidal active compound, such as one or more organophosphates, carbamates, pyrethroids and organochlorines, with a polyurethane polymer. The polymer is the reaction product of 4,4'-diphenylmethane diisocyanate, polytetramethylene glycol and 1,4-butanediol. By utilizing the particular polymers described, high loadings of insecticides are possible and the resulting product shows no tendency to exude insecticide during prolonged storage. The product made according to the invention can provide effective control of horn flies on cattle for six months or more utilizing a single ear tag or the like where it would take two tags constructed according to the prior art to achieve comparable results.

Abstract: A polymeric device and method for the control of insects on animals is disclosed. The device is in the form of an ear tag or other shape which can be attached to an animal using known techniques. A unique polymer/insecticidal formulation is provided by combining an ectoparasiticidal active compound, preferably an organophosphate, with a polyurethane polymer. The polymer is the reaction product of 4,4'-diphenylmethane diisocyanate, polytetramethylene glycol and 1,4-butanediol. By utilizing the particular polymers described, high loadings of insecticides are possible and the resulting product shows no tendency to exude insecticide during prolonged storage. The product made according to the invention can provide effective control of horn flies on cattle for six months or more utilizing a single ear tag or the like where it would take two tags constructed according to the prior art to achieve comparable results.

Abstract: The present invention relates to a method of detecting either antibody or antigen in the serum of horses infected with equine infectious anemia using a competitive enzyme-linked immunoabsorbent assay technique and reagents useful in such an assay. The competitive enzyme-linked immunoabsorbent assay incorporates a purified virus antigen conjugate and a monoclonal antibody specific for the virus antigen as both the reacting and competing components. Alternatively, the competitive enzyme-linked immunoabsorbent assay incorporates a purified virus antigen and a monoclonal antibody conjugate specific for the viral antigen as both reacting and competing components. This invention also relates to detecting antigen and antibody found in other retrovirus infections such as Acquired Immunodeficiency Syndrome in humans.