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Colour enhanced transmission electron micrograph (TEM) depicts a number of smallpox virus virions; Magnification approximately 370,000x. The dumbbell-shaped structure inside the smallpox virion is the viral core (yellow), which contains the viral DNA. This DNA acts as the blueprint by which the virus replicates itself once it is released into the host cell. Smallpox is one of two infectious diseases to have been eradicated, the other being rinderpest, which was declared eradicated in 2011.
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