<unk>  is caused by the variola virus, a dsDNA virus of the Poxviridae family. There are two forms of this virus with different virulences, as evidenced by their respective death rates.  The virus survives in the cold and aerosoled environments, which explains its oral transmission among humans.  Humans are the viruses only host which likely facilitated its eradication.  Unlike other DNA viruses,<unk>  replicates within the cytoplasm, to which it shows tropism.
Smallpox virus
Varicella zoster virus
Rubella virus
Human bocavirus
Herpes simplex virus
Measles virus
Agamid adenovirus
Epstein Barr virus