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 (green) 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 (yellow). 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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Crédit: | Science Photo Library / CDC |
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