West Nile Virus Alert Levels

West Nile virus activity in Clark County

Current Alert Level:​​​​

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West Nile virus alert level definitions

Alert level Description

 

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No risk of human outbreak

Off season. No significant mosquito activity.

 

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Remote risk of human outbreak

No West Nile virus activity (no birds, mosquitoes, horses, or people have tested positive for West Nile virus) in the state, Clark County, or bordering counties. Conditions are not conducive for mosquitoes to breed.

 

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Low risk of human outbreak

No West Nile virus activity detected in Clark County but environmental conditions are suitable for mosquitoes to breed.

 

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Moderate risk of human outbreak

Environmental conditions are ideal for mosquitoes and West Nile virus is detected in mosquitoes and dead birds in Clark County.

 

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High risk of human outbreak

Environmental conditions are ideal for mosquitoes and West Nile virus is detected in mosquitoes and dead birds in Clark County. One or more equine (horse) cases has been identified and/or one or more human cases have been diagnosed in Clark County.

 

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Human outbreak in progress

Multiple confirmed human cases with conditions favoring continued transmission to people, including persistent high infection rates in mosquitoes.