False-colour transmission electron micrograph of vaccinia virus. A member of the poxvirus family,it is the largest & most complex of the vertebr- ate viruses (230x300 nanometres in size). The virus particles appear brick-shaped & consist of a complex structure of membranes surrounding the genetic core of DNA - the nucleoid. Replication of the DNA & formation of the viral progeny occurs in the host cell's cytoplasm; most other viruses replicate in the cell nucleus. The vaccinia virus causes cowpox,a disease of cattle & humans that causes skin lesions resembling those of smallpox,but without the associated systemic disturbances. Magnification: x58,800 at 6x4.5cm size | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Davies, Dr. Heather |
Taille de l’image : | 2673 px × 3543 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |