Facioliasis is a tropical infection caused by liver flukes or Fasciola. The sheep liver fluke Fasciola hepatica is one of the most studied herbivore parasite with wide distribution. Human infections are reported in many parts of the world incuding the United States. The disease has serious economic consequences for farmers that lose their cattle due to the severe liver damaged caused by the parasite. AGENT: Fasciola hepatica (sheep liver fluke) and Fasciola gigantica (giant liver fluke)