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West Nile Virus Activity

The 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.

2019 Data

Oregon Cases

County map showing cases
Cases by county (pdf)

Number Positive

Humans 9*
Sentinel Chickens 0
Birds 0
Mosquitoes (pools) 85
Horses 7
Squirrel 0
Dogs 0
As of October 2019
*1 case acquired out-of-state
U.S. West Nile cases by state - CDC website

Data from Previous Years

Suspect Cases

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