The paramyxovirus envelope contains two transmembrane glycoproteins:
an attachment protein or cell receptor-binding glycoprotein (G) and a fusion protein (F).28 Thin-section electron microscopy (EM) of infected cells reveals filamentous nucleocapsids contained within cytoplasmic inclusions and incorporated into virions budding from the plasma membrane. Hendra virus has a double-fringed appearance caused by projections on the surface of the viral envelope, whereas Nipah virus has only a single layer of surface projections