1. World Health Organizationhttp://www.who.int/csr/disease/smallpox/en/
2. Centers for Disease Control and Preventionhttp://www.bt.cdc.gov/agent/smallpox/(All last accessed February 2015.)
3. http://www.who.int/csr/disease/smallpox/preparedness/en/
4. http://www.bt.cdc.gov/agent/smallpox/vaccination/facts.asp(All last accessed February 2015.)
5. Education about monkeypoxhttp://www.incef.org/(last accessed February 2015).