Smallpox viruses, TEM

Numéro d’image : 12527980
Smallpox viruses, TEM
Smallpox viruses. Coloured transmission electron micrograph (TEM) of variola viruses, the cause of smallpox. The virus consists of genetic material (red), DNA (deoxyribonucleic acid), enclosed by a protein capsid (coat, yellow). Variola is the most virulent member of the orthopoxvirus group. It is specific to humans, having no other animal hosts. Infection with variola causes a high temperature and skin spots that develop into scarring pustules. It is transmitted by respiratory droplets or by the pus. Smallpox was eradicated in the 1970's by a global vaccination programme. However, isolated cultures of the virus are still kept in laboratories for research purposes. Magnification: x63000 when printed 10 cm wide.
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Crédit: Science Photo Library / EYE OF SCIENCE
Taille de l’image : 5100 px × 4236 px
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