| West Nile virus alert levels |
West Nile virus activity in Clark County as of May 2009
Case histories
|
|
Exposed in Clark County |
Exposed outside Clark County |
|
Humans
|
West Nile fever |
0 |
0 |
|
West Nile neuroinvasive disease |
0 |
0 |
|
Other West Nile disease |
0 |
0 |
|
Deaths |
0 |
0 |
|
Total |
0 |
0 |
|
Bird, mosquito, horse cases in Clark County: |
|
Birds
|
0 |
Mosquitos
|
0 |
Horses
|
0 |
West Nile virus weekly update for state, regional, and national surveillance information (PDF).
West Nile virus alert level definitions
Alert level |
Description |
No risk of human outbreak
|
Off season. No significant mosquito activity. |
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. |
Low risk of human outbreak
|
No West Nile virus activity detected in Clark County but environmental conditions are suitable for mosquitoes to breed. |
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. |
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. |
Human outbreak in progress
|
Multiple confirmed human cases with conditions favoring continued transmission to people, including persistent high infection rates in mosquitoes. |
|
