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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / CDC |
Bildgröße: | 2400 px × 1613 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |