http://manbir-online.com/diseases/smallpox-2.htm

This is an image taken from an electron micrograph showing the a virus which causes smallpox. This virus is known as Variola Major. There are two major strains of the virus, Variola Major and Variola Minor.

 

References

 

CENTRE FOR DISEASE PREVENTION AND CONTROL.2007.Smallpox Disease Overview.[online] Atlanta: CDC. Available from:

http://www.bt.cdc.gov/agent/smallpox/overview/disease-facts.asp

[Accessed 1 April 2007]