Measles virus. Transmission electron micrograph (negative stain) of a measles virus (large grey body, upper centre), a type of morbilli virus. Viral nucleoprotein (part of the nucleocapsid) can be seen inside the damaged virus particle, and some has been released (white rods, lower image). The lipoprotein envelope of the virus normally encloses the nucleocapsid: a helical structure consisting of a single-stranded RNA core (genetic material) surrounded by protein. Measles is a highly infectious disease spread by droplet infection. It mainly affects children, producing fever and rash. One attack usually gives life-long immunity. Magnification: x135,000 at 8x10inch size.
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