Polio viruses

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RNA - Viruses: Picornaviruses: Polio virus. TEM of polio viruses, the causative agent of poliomyelitis (infantile paralysis). Although rounded in shape, each virus has a cubic symmetry. RNA genetic material occurs in the core of each virus (orange) surrounded by a protein coat (green). 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.

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