Ascaris lumbricoides is an intestinal roundworm. It is the largest intestinal nematode that infects humans. Adult worms live in the small intestine and grow to a length of more than 30 cm. Humans are the only natural host and reservoir of infection. The roundworm infection occurs worldwide. The number of infected persons is estimated to be more than 2 billion. The main epidemic region with a prevalence rate of approx. 10-90% includes South East Asia, Africa and Latin America countries.
Egg
Stage I: Eggs in faeces
Stage II: Development in soil
Stage III: Human infection and liberation of larvae
Stage IV: Migration of larvae through lungs
Stage V: Re-entry to the stomach and small intestine
Gastrointestinal Symptoms
(Session 2025 - 26)