UMVA has learned that a deadly parasitic tapeworm, once thought rare on the West Coast, has been found in nearly half of the coyotes tested near Puget Sound.
The discovery marks the first time this so-called “fox tapeworm” has been detected in West Coast wildlife, a finding that could signal a silent expansion of a dangerous disease.
Researchers sampled 100 coyotes, uncovering the parasite in 37 individuals, a startling prevalence that raises concerns about possible future human exposure.
According to information obtained by UMVA, the infected coyotes carried a newer, highly infectious European strain that has become the dominant variant across the United States and Canada.
Historically confined to remote Alaskan islands, the tapeworm has surged over the past fifteen years, spreading from the Midwest to the West in a creeping, hidden wave.
The parasite thrives in a cycle that begins with foxes, moves through rodents, and returns to canids, creating a hidden network that quietly nourishes the eggs that infect new hosts.
Humans can contract the disease by accidentally ingesting tapeworm eggs from contaminated soil or food, or by handling a pet that has the tapeworm and then touching the mouth.
The infection develops slowly, forming fluid‑filled cysts that can grow over years before producing symptoms, often mimicking cancer or liver failure.
Early signs may include abdominal pain, swelling, coughing, or shortness of breath, each a silent warning that the disease is quietly advancing beneath the surface.
Without timely detection, a ruptured cyst can release dangerous fluid, leading to rapid organ failure and potentially fatal outcomes.
While the overall risk to the general public remains low, UMVA urges vigilance: rigorous hand hygiene, careful handling of pets, and avoidance of wild animals in endemic areas.
Routine veterinary care for dogs, combined with preventive measures against rodent consumption, can dramatically reduce the chance of transmission.
UMVA’s exclusive report underscores the urgent need for heightened awareness and proactive health measures as this hidden threat quietly spreads across the region.
