Sources

 

http://www.umich.edu/~esupdate/library/97.11-12/tain.html 

http://www.nytimes.com/2011/04/26/opinion/26iht-edsebelius26.html?_r=0

http://search.who.int/search?q=smallpox&ie=utf8&site=who&client=_en_r&proxystylesheet=_en_r&output=xml_no_dtd&oe=utf8&getfields=doctype http://www.cdc.gov/