A significant public health concern has emerged from the Pacific Northwest as researchers confirm the presence of Echinococcus multilocularis in wild coyote populations for the first time on the West Coast. A University of Washington surveillance study examining 187 coyotes around Puget Sound between 2022 and 2025 identified the deadly tapeworm in 37% of tested animals, far exceeding initial expectations for a newly introduced parasite.
This geographic expansion marks a westward shift of E. multilocularis from its traditional range in Alaska and the northern Great Lakes region, according to CDC surveillance data. The parasite causes alveolar echinococcosis in humans, a parasitic disease with a 95% mortality rate if left untreated. The infection can remain asymptomatic for 10-15 years before progressing to fatal stages. Lead researcher Dr. Sarah Mitchell emphasizes the need for heightened awareness among healthcare providers and residents in affected regions.
Read the full article on GMJ Newsroom.
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