Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Parasites - Echinococcosis? ?
    ### Response:
    Cystic echinococcosis (CE) is caused by infection with the larval stage of Echinococcus granulosus. CE is found in Africa, Europe, Asia, the Middle East, Central and South America, and in rare cases, North America. The parasite is transmitted to dogs when they ingest the organs of other animals that contain hydatid cysts.
    