The term ascariasis refers to parasitic worms that migrate through the lungs in the larval stage primarily to the the eggs are passed on to the next individual through contact with the feces (hands, water, or food.

Intestines

Explanation:

Ascariasis is the result of infestation of the helminth Ascaris lumbricoides in the body, being most often found in the intestine. The term ascariasis refers to parasitic worms that migrate through the lungs in the larval stage mainly to the intestine.

This pathogen, popularly known as roundworm, has a cylindrical and elongated body, and can reach up to 40 centimeters in length. Females are larger and more robust than males; and they have the curled tail. Surprisingly, a single host can have up to 600 of these individuals.

He is contaminated by ingestion of his eggs, usually found in soil, water, food, and hands that have had previous contact with contaminated human feces.