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Health Officials Declare West Nile Virus Outbreak In Clark County

The Southern Nevada Health District has declared an outbreak of West Nile virus in Clark County.

The district has confirmed a record 28 cases of the mosquito-borne illness.

Nineteen percent of mosquitoes tested in the valley have been positive for West Nile, compared with less than 0.1 percent last year.

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Thirty-nine zip codes in the valley have seen West Nile-positive mosquitoes.