Variola virus
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Variola virus is the causative agent of smallpox, a formerly widespread and dangerous disease in humans. The virus is large and brick-shaped and is approximately 330 nanometers by 260 nm, with a singl
Smallpox virus virions TEM PHIL 1849
Virus
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A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all life forms, from animals and plants to microorganisms, including bacteria a
Variola virus
…variola virus occurs entirely within the cytoplasm of the host cell, and follows a distinct progression during infection. After entry of an infectious virion into a host cell, synthesis of viral mRNA can be detected within 20 minutes. About half of the viral genome is transcribed prior to the replication of…
Structure of icosahedral adenovirus; electron micrograph with an illustration to show shape
Structure of chickenpox virus. They have a lipid envelope.
Transmission electron microscope image of a recreated 1918 influenza virus
Two rotaviruses: the one on the right is coated with antibodies that prevent its attachment to cells and infecting them.