How do diseases which start in one species "jump" to another species? How do people get a flu which started in chickens? Scientists at the University of Chicago and the Field Museum are using DNA to trace how diseases like AIDS and SARS pass from one species to another.
http://www.chicagobreakingnews.com/2010/04/field-u-of-c-studying-how-disease-jumps-from-animal-to-man.html
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