Ascaris lumbricoides

A large nematode (roundworm).

Most common helminthes infection in the world.

Infections prevalent in areas with poor sanitation and tropical areas.

Transmission by fecal-oral ingestion of eggs from contaminated soil.

Eggs hatch in the gastrointestinal tract and larvae penetrate the intestinal wall and enter blood vessels.

Infections can be asymptomatic.

Entry of larvae into blood vessels can lead to pulmonary involvement resulting in pneumonia.

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