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West Nile Virus Activity

Oregon Data

Oregon Health Authority, Public Health Division works with local health departments, mosquito control districts and other agencies to detect and test for the presence of West Nile virus. Health care providers, veterinarians and diagnostic laboratories take part in surveillance efforts.

If you find a sick or dead bird

Birds are a natural host for West Nile virus; in Oregon particularly crows, ravens, jays, magpies, and sage grouse. A large or continuous die-off of birds may be a local indicator of WNV activity.

Contact one of the following Oregon agencies for collection and testing for West Nile virus surveillance:


If you suspect a horse has WNV infection

Veterinarians are required to report horses with the appropriate clinical signs. Refer to West Nile Virus testing for further information and contact the Oregon Dept. of Agriculture at 503-986-4760 before submitting horse samples.


Other animals

Any other animal suspected of having West Nile virus or other viruses carried by mosquitoes will be tested at a laboratory. If you have any questions, please call the state public health epidemiologist on call at Oregon Health Authority, Public Health Division, 971-673-1111.

(PDF format)

2015 | 2014 

| 2013 

| 2012 

| 2011 

| 2010

 | 2009

 | 2008 

| 2007 

| 2006 

| 2005 

| 2004


Cases by county (pdf)

2015

Number Positive

Humans 1
Sentinel Chickens 0
Birds 11
Mosquitoes (pools) 59
Horses 6
Squirrel 0
Dogs 0
As of Dec 31, 2015
U.S. West Nile cases by state 2015 - CDC website

County Map
Cases by county (pdf)

2014

Number Positive

Humans 8
Sentinel Chickens 0
Birds 7
Mosquitoes (pools) 58
Horses 3
Squirrel 0
Dogs 0
As of Oct. 29, 2014

U.S. West Nile cases by state
2014
- CDC website


County Map
Cases by county (pdf)

2013

Number Positive
* Acquired out of state

Humans 16*
Sentinel Chickens 0
Birds 2
Mosquitoes (pools)

89

Horses 6
Squirrel 0
Dogs 0
As of Dec 30, 2013
U.S. West Nile cases by state
2013
- CDC website

County Map
Cases by county (pdf)

2012

Number Positive

Humans 12
Sentinel Chickens 0
Birds 2
Mosquitoes (pools) 71
Horses 2
Squirrel 0
Dogs 0
As of Nov. 1, 2012
U.S. West Nile cases by state
2012
- CDC website

County Map
Cases by county (pdf)

2011

Number Positive

Humans 0
Sentinel Chickens 0
Birds 0
Mosquitoes (pools) 3
Horses 2
Squirrel 0
Dogs 0
As of December 30, 2011
U.S. West Nile cases by state
2011
- CDC website

County Map
Cases by county (pdf)
 

2010

Number Positive

Humans 0
Sentinel Chickens 0
Birds 0
Mosquitoes (pools) 4
Horses 0
Squirrel 0
Dogs 0
As of December 31, 2010
U.S. West Nile cases by state
2010
- CDC website

County Map
Cases by county (pdf)

2009

Number Positive

Humans 12
Sentinel Chickens 0
Birds 16
Mosquitoes (pools) 266
Horses 5
Squirrel 0
Dogs 1
As of December 29, 2009
U.S. West Nile cases by state
2009
- CDC website

County Map
Cases by county (pdf)

2008

Number Positive

Humans 16
Sentinel Chickens 0
Birds 2
Mosquitoes (pools) 16
Horses 0
Squirrel 0
Dogs 0
As of October 17, 2008
U.S. West Nile cases by state
2008
- CDC website

County Map
Cases by county (pdf)

2007

Number Positive

Humans 27
Sentinel Chickens 11
Corvids 52
Sage Grouse 0
Mosquitoes (pools) 32
Horses 16
Squirrel 1
Dogs 2
As of November 9, 2007
U.S. West Nile cases by state
2007
- CDC website

County Map
Cases by county (pdf)

2006

Number Positive

Humans 73
Sentinel Chickens 0
Birds 25
Mosquitoes 1100
Horses 35
As of November 21, 2006
U.S. West Nile cases by state
2006
- CDC website

Oregon county cases, 2005
Cases by county (pdf)

2005

Number Positive

Humans 8
Sentinel Chickens 17
Birds (Corvids) 15
Mosquitoes (pools) 11
Horses 46
As of October 14, 2005
U.S. West Nile cases by state
2005
- CDC website

Oregon Cases 2016


Cases by county (pdf)
2016

Number Positive

Humans 4
Sentinel Chickens 0
Birds 12
Mosquitoes (pools) 51
Horses 6
Squirrel 0
Dogs 0
As of Nov. 22, 2016
U.S. West Nile cases by state - CDC website

 

Regional Cases

Cases in Pacific NW (pdf)

As of September 29, 2015


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