Guidelines for Diagnosis and Management of Ascariasis and Trichuriasis

Epidemiology & Risk Factors

Ascariasis and trichuriasis are distributed worldwide, with the highest prevalence in rural areas of Africa, Asia, and South America where sanitation is limited. 2
Both parasites are transmitted via the fecal‑oral route. 2, 4
Prepatent period: Ascaris ≈ 2–3 months; Trichuris ≈ 60–70 days. 2
Children younger than 5 years and migrants from endemic regions are the most vulnerable populations. 5

Ascariasis is often asymptomatic; when symptoms occur they include abdominal pain, diarrhea, and the passage of earthworm‑sized pink/white worms in stool or vomitus. 2
Trichuriasis is usually asymptomatic; heavy infection can cause anemia, dysentery, rectal prolapse, and impaired growth and cognitive development in children. 4
Acute complications of ascariasis: intestinal obstruction in children, biliary obstruction in adults, and Loeffler’s syndrome (pulmonary migration phase). 2
Acute complications of trichuriasis: severe dysentery and rectal prolapse in heavily infected individuals. 4

Concentrated stool microscopy or fecal PCR are the primary diagnostic methods for both parasites. 2, 4
Eosinophilia may be transient during the tissue‑migration phase; stool microscopy becomes positive only after worms have reached the intestinal lumen. 5
Chest radiography in Loeffler’s syndrome shows migratory pulmonary infiltrates. 6
Laboratory findings may include eosinophilia (especially during migration) and anemia in heavy trichuriasis. 5, 4

Ascariasis: a single oral dose of albendazole 400 mg or mebendazole 500 mg or ivermectin 200 µg/kg is effective. 2
Trichuriasis: combination therapy with mebendazole 100 mg twice daily plus ivermectin 200 µg/kg once daily for three days improves cure rates in heavy infections. 4
Loeffler’s syndrome: empirical ivermectin 200 µg/kg plus albendazole 400 mg is recommended; steroids should be used cautiously due to the risk of Strongyloides hyperinfection, and retreatment is advised one month after resolution. 6
Cure rates are very high for ascariasis with single‑dose therapy, whereas trichuriasis has lower cure rates, supporting the use of combination therapy. 4

Stool microscopy may be falsely negative during the prepatent period, leading to missed diagnoses. 5

Single‑dose albendazole, mebendazole, or ivermectin provides excellent cure rates for ascariasis. 2
Combination therapy (mebendazole + ivermectin) is recommended for trichuriasis to achieve adequate cure rates, especially in heavy infections. 4