America's death toll from West Nile virus has risen to eight so far this year.
The latest victim is a 67-year-old woman in Boulder, Colorado, who had encephalitis. Lab tests confirmed the virus.
She was the fifth person to die from West Nile in Colorado thus far this year. Twelve new cases are reported in the state, although health officials think the actual number may be higher.
West Nile was first detected in Colorado last summer, infecting 13 people but killing none. This year, the state leads the nation with 166 human cases.
The only known link among the fatalities is their ages, all were elderly. A Boulder health official says people 50 and over face a greater risk of dying from West Nile.
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Source: www.vdh.state.va.us contributed to this report