Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Parasites - Hookworm? ?
    ### Response:
    Hookworm is a soil-transmitted helminth (STH) and is one of the most common roundworm of humans. Infection is caused by the nematode parasites Necator americanus and Ancylostoma duodenale. Hookworm infections often occur in areas where human feces are used as fertilizer or where defecation onto soil happens.
    