[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Microbiology](https://durgical.com/en/microbiology/) › [Nematodes](https://durgical.com/en/microbiology/groups/nematodes/) › Trichuris trichiura

[Microbiology](https://durgical.com/en/microbiology/) · [Nematodes](https://durgical.com/en/microbiology/groups/nematodes/)

# Trichuris trichiura

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- Exam priority: high

A whip-shaped colon worm, the commonest soil-transmitted helminth in Colombian schoolchildren; heavy loads cause dysentery and rectal prolapse.

Updated 2026-11-01

Also called: whipworm

## Key points

- Barrel-shaped egg with two polar plugs.
- Lives in the caecum and colon, no lung passage.
- Massive infection → dysentery and rectal prolapse in children.
- Most common soil-transmitted helminth in Colombian schoolchildren.
- Poorer response to a single benzimidazole dose.

## At a glance

**Shape**
Whip-shaped: long thin front end, thick back end

**Family**
Trichuridae

**Type**
Intestinal nematode (soil-transmitted helminth)

**Size**
Adults 3–5 cm

## Morphology

- Barrel- or lemon-shaped egg, 50–55 × 20–25 µm, with a polar plug at each end.
- Thick brown shell; passed unembryonated.
- The adult threads its thin end into the colonic mucosa.

## Transmission

- Swallowing embryonated eggs from faecally contaminated soil.
- Dirty hands, poorly washed vegetables and unsafe water.
- No direct person-to-person spread.

**Reservoir:** Humans; Contaminated soil

### Isolation precautions

What the care team adds to standard precautions.

- Standard

## Life cycle

- Eggs leave in stool unembryonated.
- In soil they embryonate and become infective in about 15–30 days.
- Once swallowed, they hatch in the small bowel and larvae move to the caecum and ascending colon.
- The adult embeds its thin end in the colonic mucosa; there is no lung passage.
- The female lays thousands of eggs a day from 60–70 days on; adults live about a year.

## Virulence factors

- The embedded front end inflames the colonic mucosa and makes it bleed.
- Heavy loads cause colitis with straining, tenesmus and blood.
- Chronic straining on inflamed mucosa favours rectal prolapse in children.
- Chronic blood loss adds to anaemia and stunting.

## Diseases it causes

- Trichuriasis [Soil-transmitted helminthiasis (ascariasis, hookworm, trichuriasis) →](https://durgical.com/en/conditions/soil-transmitted-helminthiasis/)
- Rectal prolapse in children with massive infection [Rectal prolapse →](https://durgical.com/en/conditions/rectal-prolapse/)
- Iron-deficiency anaemia from chronic colonic bleeding [Iron deficiency anaemia →](https://durgical.com/en/conditions/iron-deficiency-anaemia/)

## Clinical picture

- Most infections are asymptomatic.
- Dysentery syndrome with tenesmus at heavy loads.
- Rectal prolapse with worms visible on the mucosa.
- Anaemia, malnutrition and finger clubbing in intense chronic infection.

## Diagnosis

- Barrel-shaped eggs with polar plugs on stool microscopy; concentration recommended.
- Kato-Katz to estimate intensity.
- Proctoscopy or colonoscopy: worms attached to the mucosa.

## Treatment

Benzimidazoles (albendazole or mebendazole); it responds less well than Ascaris to a single dose, so repeated courses or combinations with ivermectin are used.

Drug class only; doses and regimens are set by the clinician from the current guideline.

In Pharmacology:

- [Albendazole](https://durgical.com/en/pharmacology/albendazole/)
- [Mebendazole](https://durgical.com/en/pharmacology/mebendazole/)
- [Ivermectin](https://durgical.com/en/pharmacology/ivermectin/)

## Prevention

- Sanitation, safe water and handwashing.
- Washing fruit and vegetables.
- Periodic school deworming in at-risk areas.

## In Colombia

It was the most frequent soil-transmitted helminth in the national school survey (2012–2014): 18.4% of children. It is a core target of mass school deworming.

## Memory aid

A whip in the colon, a barrel in the stool: the whipworm lashes the mucosa until the rectum slips out.

## Test yourself

Think of the answer, then tap the question to see it.

## What does the Trichuris trichiura egg look like?

Barrel-shaped, thick-walled, with a polar plug at each end.

## Where does the adult Trichuris live?

In the caecum and ascending colon, with its front end embedded in the mucosa.

## What classic complication does massive trichuriasis cause in children?

Rectal prolapse, often with worms visible on the prolapsed mucosa.

## Which soil-transmitted helminth was most frequent in Colombia's national school survey?

Trichuris trichiura, in about 18% of children.

[Add to my cards (4)](https://durgical.app/estudiar/?add=/en/microbiology/trichuris-trichiura/)

## Related

- [Ascaris lumbricoides](https://durgical.com/en/microbiology/ascaris-lumbricoides/)
- [Necator americanus / Ancylostoma duodenale](https://durgical.com/en/microbiology/necator-americanus-ancylostoma-duodenale/)
- [Enterobius vermicularis](https://durgical.com/en/microbiology/enterobius-vermicularis/)

## Related conditions

- [Soil-transmitted helminthiasis (ascariasis, hookworm, trichuriasis)](https://durgical.com/en/conditions/soil-transmitted-helminthiasis/)
- [Rectal prolapse](https://durgical.com/en/conditions/rectal-prolapse/)
- [Iron deficiency anaemia](https://durgical.com/en/conditions/iron-deficiency-anaemia/)

## What the colours mean

**Gram-positive**
Thick peptidoglycan wall: stains purple.

**Gram-negative**
Thin wall with an outer membrane: stains pink.

**Acid-fast**
Lipid-rich wall (mycobacteria): Ziehl–Neelsen stain.

[← Back to the group: Nematodes](https://durgical.com/en/microbiology/groups/nematodes/)

Educational content on microorganisms; not a treatment guide and no substitute for a health professional's advice. No doses are given.

Sources: [CDC - DPDx - Trichuriasis](https://www.cdc.gov/dpdx/trichuriasis/index.html) (CDC, 2024); [Soil-transmitted helminth infections](https://www.who.int/news-room/fact-sheets/detail/soil-transmitted-helminth-infections) (WHO, 2023); [Whipworm infection: MedlinePlus Medical Encyclopedia](https://medlineplus.gov/ency/article/001364.htm) (MedlinePlus (NLM), 2024); [Geohelmintiasis](https://minsalud.gov.co/salud/publica/PET/Paginas/geohelmintiasis.aspx) (Ministerio de Salud y Protección Social de Colombia, 2014).

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Representative model, for educational purposes only.

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License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/microbiology/trichuris-trichiura/