The Interaction of Serum with Erythrocytes Modified by Newcastle Disease Virus

Abstract
The cell-sensitizing substance of Newcastle disease virus (NDV) differs from the virus hemagglutinin. Two different sorts of red cell sensitization may occur, one of which results in agglutination by immune serum, the other in agglutination by infectious mononucleosis serum. The sensitizing component for infectious mononucleosis serum varies with the NDV strain and persists through passage at limiting dilutions. It may be a useful genetic marker.