Zoonotic Diseases - Washington Tracking Network (WTN)

Why Should I be Concerned About Zoonotic Diseases?

Zoonotic diseases are infectious diseases that can pass from insects or animals to people, or from people to animals. Viruses, bacteria, parasites, and fungi are causes of zoonotic diseases. It's estimated that sixty percent of the infectious diseases in people originated in animals. While serious, zoonotic diseases are usually preventable.

By monitoring zoonotic disease activity in animals, we can identify when and where there may be an exposure risk for people and animals. We can then target control and prevention responses to minimize the health impacts. While there are many zoonotic diseases, two of them have sufficient data to provide through this data portal.

West Nile virus infection

In 2009, coinciding with state's worst outbreak of West Nile virus, environmental surveillance detected infection in 72 horses, many of which died or were euthanized, one dog, 22 birds, and 364 mosquito samples.

The mosquito species, Culex pipiens and Cx. tarsalis, are principal carriers of West Nile virus. Both species are found across the state.

Canine leptospirosis infection

The majority of canine leptospirosis cases are reported from western Washington. This trend closely follows the pattern of precipitation typical of this region.

View the Data

West Nile Virus - Mosquitoes

West Nile Virus - Mammals

West Nile Virus - Birds

Reduce Exposure

To learn more about these zoontic diseases and the impact they can have on health, visit the West Nile virus and Canine Leptospirosis webpages.

Contact Us

For information or questions related to the Washington Tracking Network, email DOH.WTN@doh.wa.gov.

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National Environmental Public Health Tracking Program