False-colour transmission electron micrograph (TEM) of numerous virions (virus particles) of the polio virus,the causative agent of poliomyelitis. Polioviruses belong to the enterovirus sub-group of the picornaviruses (small RNA viruses) & occur as 3 antigenically-distinct types; type 1 is responsible for the majority of polio epidemics. Infection occurs through the mouth,with the virus travelling via lymph nodes in the gut & upper respiratory tract to the central nervous system,where viral replication (especially in horn cells of spinal cord) may produce paralytic poliomyelitis (causing death or severe & permanent disability). Magnification: x29,400 at 35mm size | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / CNRI |
Taille de l’image : | 3972 px × 2692 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |