Particles ca. 180 x 70nm with unique bullet-shaped appearance (all rather similar). Enveloped with prominent spikes on surface (G protein - haemagglutinates RBCs), but not very variable in appearance. The envelope is lined by the matrix protein and contains the nucleocapsid (RNA + N protein) wound helically inside the core. Two non-structural proteins, L and NS, are associated with the nucleocapsid and act in concert as the viral polymerase. As with most enveloped viruses, the particle is relatively labile.
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