West Nile Virus

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West Nile virus season ends

Columbia Basin Herald - Tue Dec 1, 11:47 am ET

COLUMBIA BASIN — The Washington State Department of Health (DOH) declared the 2009 West Nile virus season, the most active on record, is over. The 2009 season ended as cold fall weather approached. August is generally the peak of the season, according to a DOH representative.