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West Nile virus outbreak

Associated Press
This undated photo provided by the Northwest Mosquito Abatement District  shows a Culex pipiens, left, the primary mosquito that can transmit West Nile virus to humans, birds and other animals. It is produced from stagnant water. The bite of this mosquito is very gentle and usually unnoticed by people. At right is an Aedes vexans, primarily a nuisance mosquito produced from freshwater. It is a very aggressive biting mosquito but not an important transmitter of disease. (AP Photo/courtesy the Northwestern Mosquito Abatement District)

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The United States is experiencing its worst seasonal outbreak of the mosquito-borne West Nile virus. A total of 3,545 cases, including 147 deaths, were reported in the United States in 2012, the highest human toll by that point in the calendar since the mosquito-borne disease was first detected in the country in 1999.

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