In this April 23, 2014 photo, a yellow fever mosquito, or Aedes aegypti, feeds on pig blood in a lab at the National Center for Agricultural Utilization Research in Peoria, Ill. Scientist Alejandro Rooney is engaged in new research efforts to battle dangerous mosquito varieties such as the Asian Tiger, yellow fever and floodwater species at the Peoria Ag Lab. (AP Photo/Journal Star, David Zalaznik)
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