The Dangers of Roundworm Infection in Children: Dr. Tita Explains the Infection Cycle of Ascaris

Roundworm infection, particularly that caused by Ascaris lumbricoides, remains a serious threat to children’s health. Dr. Tita has revealed that the infection process of roundworms is far more complex than commonly understood, involving passage through the lungs before ultimately settling in the intestines.

Unlike pinworms, roundworms belong to the Soil Transmitted Helminths (STH) group—parasites that require soil as a medium for their development into the infective stage.

Infection typically begins with simple activities, such as children playing in soil or consuming food and water contaminated with roundworm eggs. The following describes how these parasites take over the host’s body:

• Ingestion into the Digestive Tract: Roundworm eggs present in soil or food enter the mouth and travel to the intestines.

• Hatching into Larvae: Within the intestines, eggs hatch into larvae. Notably, these larvae do not remain there immediately; instead, they penetrate the intestinal wall and enter blood vessels.

• Migration to the Lungs: Via blood circulation, the larvae “travel” until they reach the lungs and ascend through the respiratory tract. This condition frequently triggers coughing in children.

• Reingestion: When larvae reach the throat, they are swallowed again into the digestive tract for a second time.

• Maturation in the Small Intestine: Here the larvae settle and develop into adult male and female worms capable of reproduction.

One reason children’s abdomens can become populated with numerous roundworms is the speed at which they produce eggs. Dr. Tita explained that a single adult female roundworm can produce up to 200,000 eggs per day.

“The lifespan of a single roundworm can reach 1 to 2 years. Consider how many eggs can accumulate in the human intestines over that period,” said Dr. Tita.

This cycle continues to repeat if environmental sanitation remains poor. Roundworm eggs exit through human faeces. If a person practises open defecation or does not use proper sanitation facilities, these eggs will re-contaminate soil and remain ready to infect others.

Parents are urged to strictly monitor their children’s hand hygiene after playing and ensure that food consumed is hygienic in order to break the chain of parasite transmission.

Poor sanitation, limited access to clean water, and inadequate public awareness of hygienic practices make roundworm infections difficult to eradicate.