Explain the pathogenesis in humans caused by adults and larvae of Ancylostoma duodenale.

Pathogenesis of Ancylostoma duodenale in Humans

Ancylostoma duodenale is a hookworm species that causes a parasitic infection in humans. The pathogenesis involves a series of stages as the hookworm passes through various life cycle phases within the human host, from larvae to adult worms. The infection primarily affects the gastrointestinal tract, but its impact is systemic, causing both local and systemic symptoms.

Infection Process and Migration of Larvae

The infection begins when infective larvae of *A. duodenale*, which are present in contaminated soil, penetrate the skin upon contact. This typically occurs when a person walks barefoot on soil contaminated with hookworm eggs. The larvae then enter the bloodstream, and are carried to the lungs. In the lungs, the larvae mature further, travel up the respiratory tract, and are eventually swallowed. Once in the small intestine, they mature into adult worms.

Larval Migration and Pathogenic Effects

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