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Polio viruses. Transmission Electron Micrograph (TEM) of polio viruses, the causative agent of poliomyelitis (infantile paralysis). Although rounded in shape, each virus has a cubic symmetry. They are RNA picornaviruses. RNA genetic material occurs in the core of each virus, surrounded by a protein coat (blue). There are three types of polio viruses, type 1 being the cause of most polio epidemics. 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: x90,000 at 6x7cm size.
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