NIBSC / SCIENCE PHOTO LIBRARY NIBSC / SCIENCE PHOTO LIBRARY
Measles virus. Transmission electron micrograph (negative stain) of a measles virus (centre), which is a type of morbillivirus. Fragments of viral nucleoprotein (part of the nucleocapsid) have been released; they have a 'herring bone' appearance. Surface spikes are visible on the outer lipoprotein membrane, or envelope, of the virus. The envelope normally encloses the nucleocapsid: a helical structure consisting of a single-stranded RNA core (genetic material) surrounded by protein. Measles is highly infectious and mainly affects children, producing fever and rash. One attack usually gives life-long immunity. Magnification: x180,000 at 8x10inch size.
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