Infection of Ascaris usually occurs by which of the following means?

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Tsetse fly.

Mosquito bite.

Eating imperfectly cooked pork.

Drinking water containing eggs of Ascaris.

answer is C.

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Detailed Solution

Concept: Ascaris lumbricoides is the roundworm that causes ascariasis. It is an endoparasite that attaches to the intestine.

Ascaris eggs are present in excreta of infected people's feces, contaminating soil, water, and plants.

A healthy person becomes infected after consuming water or food contaminated with the feces of an infected person (fecal-oral route transmission).

As a result, Ascaris infection is usually caused by drinking water containing Ascaris eggs.

Hence, the correct answer is option C.

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