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Measles virus particles. Coloured transmission electron micrograph (TEM) of a measles virus particle. This virus, from the Morbillivirus group of viruses, consists of an RNA (ribonucleic acid) core surrounded by an envelope studded with surface proteins (green), which are used to attach to and penetrate a host cell. RNA strands are visible here in red, both inside and outside the virus particle. Measles is a highly infectious itchy rash with a fever. It mainly affects children, but one attack usually gives life-long immunity. Magnification: x53,000 when printed at 10 centimetres across.
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