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West Nile Virus Logs Deadlist Year After Hotter Summer

The West Nile virus that swept through the U.S. last year was the deadliest on record, killing 286 people as the warmer-than-average summer may have helped the mosquito-borne virus spread, U.S. health officials said.

The U.S. had 5,674 cases in 2012, the largest number of infections since 2003, the Centers for Disease Control and Prevention said. Cases were reported in every continental U.S. state except for Oregon, including the first-ever instance of the virus recorded in Maine, the CDC said in a report today.