Smallpox viruses, TEM

Smallpox viruses, TEM

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Caption: Smallpox viruses. Coloured transmission electron micrograph (TEM) of Variola major viruses, the cause of smallpox. The virus consists of genetic material (red), DNA (deoxyribonucleic acid), enclosed by a protein capsid (coat, green). Variola is the most virulent member of the orthopoxvirus group. Variola major is specific to humans, having no other animal hosts. Infection 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: x40,700 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, infectious, many, micrograph, microscope, multiple, orthopoxviridiae, orthopoxvirus, particle, particles, pathogen, pathogenic, protein coat, smallpox virus, tem, transmission electron, transmission electron micrograph, variola major virus, viral, virus, viruses

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