Skip to main content - The Official Portal for North Dakota State Government

Giant Liver Fluke

Looks Bad

Commonly infected wildlife


Is this animal infected?

  • Animals rarely show external signs
  • Livers may by swollen and lumpy (see photo)
  • Purple-gray, flat, oval-shaped worms (fluke) may be seen in the liver
  • Worms vary in size from 1/2"-1-1/4" wide and 1-1/4"-3-1/4" long (some reports claim up to 4 inches long)

Giant Liver Fluke

Can I get it?


  • Liver flukes do NOT affect the meat

How bad can it get?


No risk to humans

Protect myself and others

  • The meat of infected animals can be eaten, BUT
    • Discard infected liver
    • Infected liver is unappetizing

Symptoms in humans

  • None – people are not at risk

Safe for pets?


safe for pets

What causes it?

  • A flatworm (fluke) called Fascioloides magna