Abstract
Summary: The two antigens of coxsackievirus, Type B-5, separated by centrifugation in sucrose and cesium chloride density gradients, were shown to be very similar to the C and D antigens of poliomyelitis virus in their infectivity, complement-fixing properties, particle size and shape, and nucleic acid content. Certain practical aspects of the efficiency of separation of the C and D antigens in sucrose and cesium chloride density gradients were also discussed.