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Coloured TEM of clusters of polio viruses (type 1)

Coloured TEM of clusters of polio viruses (type 1)

M050/0657

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Credit

CDC / SCIENCE PHOTO LIBRARY CDC / SCIENCE PHOTO LIBRARY

Caption

Polio viruses (type 1). Coloured transmission electron micrograph (TEM) of clusters of polio viruses, the cause of poliomyelitis (infantile paralysis). There are three serotypes of the polio virus, and this is type 1 which causes most epidemics. Although rounded in shape (pink) each virus has a cubic symmetry. They are picorna- viruses. RNA genetic material occurs in the core of each virus, surrounded by a protein coat (white). Infection occurs through the mouth. Usually only a mild illness results; but in more serious cases the virus may attack the nervous system causing paralysis or even death. Polio vaccines are available. Magnification: unknown.

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