Ascaris Lumbricoides

Ascaris Lumbricoides

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Ascaris Lumbricoides: ascariasis parasite worm causing ascariasis

What they are - biological definition

This nematode worm, known as Ascaris lumbricoides, is a parasite commonly known as intestinal roundworm. This microorganism infects humans and most often children. It is usually lodged in the small intestine and sometimes directed to other parts of the body. Its length can vary from 15 to 25 cm.


Their eggs develop in water or on damp soil, making them infective shortly after contact with these regions.

Human infection occurs when they eat contaminated food or when children, after contact with contaminated soil, put their hands to their mouths.

Once ingested, the eggs go to the intestine, where the larvae, which pass through the intestinal wall and into the liver, heart and lungs, are released. During this course, the larvae undergo various changes and subsequently rise towards the bronchi, pharynx (where they are swallowed), returning to the small intestine through the digestive tract, where they eventually become adults.

Once adult, fertilization occurs and the female releases her eggs, which come out along with the feces to start a new cycle.

Scientific classification

Kingdom: Animalia

Phylum: Nematoda

Class: Secernentea

Order: Ascaridide

Family: Ascarididae

Genre: Ascaris