Case reports in Seattle, King County, WA state

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	Home » West Nile Virus » Alert levels

West Nile Virus
Case reports in Seattle, King County, WA state

West Nile virus activity in King County 2007 through 12/31/07

Current Alert Level:

Case histories

		Exposed in King County	Exposed outside King County
Humans	West Nile fever	0	2
	West Nile neuroinvasive disease	0	0
	Other West Nile disease	0	0
	Deaths	0	0
	Total	0	0
Birds	0
Mosquitoes	0
Horses	0

West Nile virus alert level definitions

Alert Level

Description

No risk of human outbreak

Winter season; little or no mosquito activity.

Remote risk of human outbreak

No West Nile virus positive birds or mosquitoes and no cases in horses or people in King County in the current calendar year.

Low risk of human outbreak

Areas of King County with limited West Nile virus activity in birds and/or mosquitoes but no positives prior to August 1.

Moderate risk of human outbreak

First West Nile virus positive birds or mosquitoes found before August 1

OR a confirmed horse or human case

OR sustained West Nile virus activity in birds or mosquitoes in the absence of horse or human cases.

High risk of human outbreak

Combinations of the following indicators:

a)	high dead bird densities starting in early summer;
b)	sustained high mosquito infection rates and/or multiple positive mosquito species;
c)	increasing number of infected horses or other mammals;
e)	a human case with high levels of bird, mosquito or horse infections;
f)	areas with early West Nile virus activity that experienced epidemic conditions in past years.

Human outbreak in progress

Multiple confirmed human cases with conditions favoring continued transmission to people (e.g., persistent high infection rates in mosquitoes, continued bird deaths due to West Nile virus)

Links

Help fight West Nile virus!

Report dead birds found in King County
year-around online or by calling Public Health at 206-205-4394.