Some Properties of an Inhibitor of Polyoma Virus Hemagglutination Isolated from Bovine Serum

Abstract
One of the several substances found in bovine serum which prevent agglutination of erythrocytes by polyoma virus has been isolated. The kinetics of its action indicate it reacts with the virus to form a product whose stability only at low temperature closely resembles the virus-erythrocyte complex. Like the red cell receptor, it is a mucoprotein. Some of its chemical and physical characteristics, as well as its visualization in the electron microscope, are described.