The Metropolitan Mosquito Control District is treating twenty thousand wetlands around the Twin Cities to try to kill the pests, and to cut down on West Nile virus later this summer.
The number of West Nile cases has increased each year in Minnesota, up to 101 human cases last year. Human infection can send victims to the hospital.
The Metropolitan Mosquito Control District has been in business for 50 years, but the last seven have mostly been dedicated to battling West Nile.
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Information from: WCCO-TV, http://www.wcco.com