Smallpox viruses, TEM

Smallpox viruses, TEM

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Caption: 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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Keywords: biological, biology, capsid, coloured, condition, deoxyribonucleic acid, disease, disorder, dna, eradicated, false-colour, false-coloured, images, infectious, magnified image, micrograph, microscopic photos, orthopoxviridiae, orthopoxvirus, particle, particles, pathogen, pathogenic, protein coat, smallpox virus, subjects, tem, transmission electron, transmission electron microscope, variola virus, viral, virology, virus, viruses

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