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t-shirts polio t-shirts polio virus t-shirts tem t-shirts micrography t-shirts micrograph t-shirts micrographs t-shirts magnification t-shirts close-up t-shirts illness t-shirts sickness t-shirts viral infection t-shirts disease t-shirts infectious disease t-shirts pathology t-shirts medical t-shirts

photographs polio photos polio virus photos tem photos micrography photos micrograph photos micrographs photos magnification photos close-up photos illness photos sickness photos viral infection photos disease photos infectious disease photos pathology photos medical photos

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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.