Measles viruses

Measles virus. Coloured transmission electronmicrograph (TEM) of measles viruses (morbillivirus group) budding off the surfaceof an infected cell (bottom, pink/yellow). Thelipoprotein envelopes of the viruses (red)surround the nucleocapsid (blue). The envelopesare acquired from the host cell's cytoplasmicmembrane as the viruses bud from the surface. Theyenclose the nucleocapsid: a helical structureconsisting of a single-stranded RNA core (geneticmaterial) surrounded by protein. Measles is veryinfectious and mainly affects children, producingfever and rash. One attack usually gives life-longimmunity. Magnification: x14, 400 at 6x6cm size.. Stunning Photo Gifts From Science Photo Library

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