Deadly ‘fox tapeworm’ linked to lethal disease detected in West Coast wildlife

Live updates

1. 11h ago

   Deadly fox tapeworm confirmed in Pacific Northwest wildlife; human risk low but expanding

   The parasitic tapeworm *Echinococcus multilocularis*—known as the fox tapeworm—has been detected in wild animals along the U.S. West Coast for the first time, including coyotes in the Pacific Northwest. The parasite, which causes echinococcosis, a severe and potentially fatal disease in humans, was previously found in 37% of coyotes near Puget Sound. Health officials stress the risk of human infection remains low but warn of its growing presence beyond historic ranges. Dog owners, hikers, and residents in Washington, Oregon, and British Columbia are advised to take precautions.

   What's confirmed:

   • The tapeworm *Echinococcus multilocularis* has been identified in wild animals on the U.S. West Coast for the first time, including coyotes in the Pacific Northwest.
   • The parasite causes echinococcosis, a severe and potentially lethal disease in humans, with symptoms resembling cancer.
   • Researchers have previously found the tapeworm in 37% of coyotes near Puget Sound, marking its first detection in wild animals on the West Coast.
   • Health officials emphasize that while the tapeworm’s presence is expanding, the risk of human infection remains low.
   • The tapeworm’s historic range did not include the Pacific Northwest, indicating a recent and concerning spread.

   Still unconfirmed:

   • A blog post suggests the tapeworm may now be present in forests, suburbs, and city parks across Washington, Oregon, and British Columbia, though this has not been independently verified or confirmed by health authorities.
   confidence 95%
2. 1d ago

   Deadly fox tapeworm detected in West Coast wildlife for first time

   A lethal tapeworm, *Echinococcus multilocularis*, has been found in 37% of coyotes near Puget Sound—its first detection in wild animals on the U.S. West Coast. The parasite causes echinococcosis, a severe, cancer-like disease in humans. Researchers warn of potential spread but emphasize human infection risk remains low. Health officials urge caution as the parasite expands beyond its historic range.

   What's confirmed:

   • The tapeworm *Echinococcus multilocularis* has been detected in 37% of coyotes tested around Puget Sound, Washington, marking its first appearance in wild animals on the U.S. West Coast.
   • The parasite causes echinococcosis, a lethal disease that mimics liver cancer and cirrhosis in humans.
   • Researchers confirm this is the first documented case of the tapeworm in West Coast wildlife, despite its long presence in other regions of North America.
   • Health authorities describe the detection as unexpected, given the parasite’s absence in the region prior to recent surveys.
   • While the parasite’s presence in wildlife raises concerns, current evidence suggests human infection risk remains low in the area.

   Still unconfirmed:

   • A single source claims the tapeworm’s spread could lead to an outbreak comparable to recent Ebola concerns, though no evidence supports this comparison.
   • Unverified reports suggest the parasite may already be present in other West Coast species beyond coyotes, but no confirmed cases have been documented.
   • One outlet speculates the tapeworm’s arrival could signal broader ecological disruption, though no studies confirm this impact.
   confidence 98%