SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Adult liver fluke (Fasciola hepatica) on the surface of a freshly-killed sheep liver. This parasitic flatworm is the cause of fascioliasis in humans, sheep and cattle. Fascioliasis is a liver disease that causes digestive problems, fever, pain, anaemia and jaundice. It causes serious losses of livestock across the world, and is also thought to affect more than two million people. The flukes migrate to the liver after being ingested in contaminated water or food, in particular watercress. The adult forms live inside the liver, feeding on blood and liver cells. Its eggs are passed in faeces, and the fluke completes its life cycle as a parasite in freshwater snails. Filmed at Ridgeway Research, Gloucestershire, UK.
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