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Dr. Wendy Chung, Chief Epidemiologist for the Dallas County Health & Human Services stands in front of standing water, a possible breeding ground for mosquitoes on Aug. 29, 2012 in Dallas. Chung keeps careful watch over the human dimension of the West Nile outbreak. A dozen thick binders stacked on a filing cabinet bear testimony to the epidemic’s scope. Each volume is packed with personal descriptions of the illnesses West Nile has unleashed here since June 20, the day the first human infection was confirmed.

David Woo / AP Photo/The Dallas Morning News