Puget Sound Coyotes Reveal Hidden Tapeworm Threat

Researchers in the Puget Sound region detected the tapeworm Echinococcus multilocularis in 37% of 100 coyotes, marking the first wild West Coast detection in the contiguous U.S.; the parasite can trigger cancer-like liver cysts in humans and dogs and uses a multi-host life cycle involving canids and rodents. Genetic analysis links a more infectious European-origin strain now circulating in North America; human West Coast cases remain rare, though canine infections have occurred. The study calls for enhanced wildlife surveillance and routine veterinary care to reduce risk.