Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Parasites - Fascioliasis (Fasciola Infection)? ?
    ### Response:
    Fascioliasis occurs in many areas of the world and usually is caused by F. hepatica, which is a common liver fluke of sheep and cattle. In general, fascioliasis is more common and widespread in animals than in people. Even so, the number of infected people in the world is thought to exceed 2 million.
    