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A mosquito on human skin. (AP Photo/USDA, File)

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The Barnes family with the help of friends salvage what is left of their home that was damaged from severe weather on Tuesday, April 29, 2014 in Tupelo, Miss. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning. (AP Photo/Hunt Mercier)

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Volunteers help clean up after a tornado passed through destroying the Kimberly Fire Department on Tuesday, April 29, 2014, in Kimberly, Ala. (AP Photo/Butch Dill)

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Mike Pettigrew moves chairs in the badly damaged building that once was the American Legion in Tupelo, Miss Tuesday, April 29, 2014. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning. (AP Photo/Zachary Odom)

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Theresa Long picks up debris at her house in Mayflower, Ark., Tuesday, April 29, 2014, after it was damaged in a tornado. (AP Photo/Danny Johnston)

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Mike Mlller, from the Big Oak Ranch, cuts up a tree that fell after a tornado passed through damaging homes and business' on Tuesday, April 29, 2014, in Kimberly, Ala. (AP Photo/Butch Dill)