Myxovirus-like Structure of Avian Myeloblastosis Virus

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Abstract
The fine structure of myeloblastosis virus resembles that of the myxoviruses, both in the presence of spikes at the surface and a filamentous element in the interior. The appearance of these filaments is, however, different from those of the myxoviruses. The filaments of the Newcastle disease virus-mumps-parainfluenza group are broader, more rigid and have a central canal. Although the internal filaments of influenza viruses are also flexible, they are considerably greater in diameter than those of myeloblastosis virus.