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== Summary ==
{{Information
|Description=This thin-section transmission electron micrograph (TEM) revealed the ultrastructural appearance of a single virus particle, or “virion”, of measles virus. The measles virus is a paramyxovirus, of the genus Morbillivirus. It is 100-200 nm in diameter, with a core of single-stranded RNA, and is closely related to the rinderpest and canine distemper viruses. Two membrane envelope proteins are important in pathogenesis. They are the F (fusion) protein, which is responsible for fusion of virus and host cell membranes, viral penetration, and hemolysis, and the H (hemagglutinin) protein, which is responsible for adsorption of virus to cells.
There is only one antigenic type of measles virus. Although studies have documented changes in the H glycoprotein, these changes do not appear to be epidemiologically important (i.e., no change in vaccine efficacy has been observed).
|Source=http://commons.wikimedia.org/wiki/File:Measles_virus.JPG
|Date=2 July 2006
|Author=(Photo Credit: Cynthia S. Goldsmith, Content Providers(s): CDC/ Courtesy of Cynthia S. Goldsmith; William Bellini, Ph.D.) Joelmills
|Permission=See below
}}
== Licensing: ==
This image is a work of the Centers for Disease Control and Prevention, part of the United States Department of Health and Human Services, taken or made during the course of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.
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