Trichuris trichiura

A parasitic roundworm of the human large intestine

Trichuris trichiura, commonly known as the human whipworm, is a parasitic roundworm that infects the large intestine of humans. It is responsible for the disease known as trichuriasis.

Description

Trichuris trichiura is characterized by its whip-like shape, with a long, slender anterior end and a thicker posterior end. The male and female worms differ in size, with males measuring approximately 30-45 mm in length and females being slightly larger at 35-50 mm.

Life Cycle

The life cycle of Trichuris trichiura begins when embryonated eggs are ingested by a human host. The eggs hatch in the small intestine, releasing larvae that mature and migrate to the large intestine. Here, they embed in the mucosa and develop into adult worms. The adult worms produce eggs that are passed in the feces, continuing the cycle. The entire life cycle is depicted in the image below:

Life cycle of Trichuris trichiura

Pathology

Infection with Trichuris trichiura can lead to trichuriasis, which is often asymptomatic in light infections. However, heavy infections can cause abdominal pain, diarrhea, and rectal prolapse. The worms can cause damage to the intestinal wall, leading to inflammation and secondary infections.

Diagnosis

Diagnosis of trichuriasis is typically made by identifying the characteristic eggs in stool samples. The eggs are lemon-shaped with bipolar plugs, as shown in the image below:

Trichuris trichiura eggs, including H&E stain

Treatment

Treatment for trichuriasis usually involves the use of anthelmintic medications such as albendazole or mebendazole. These medications are effective in reducing worm burden and alleviating symptoms.

Prevention

Preventive measures include improving sanitation and hygiene practices to reduce fecal contamination of soil and water. Educating communities about the importance of handwashing and proper disposal of human waste can help prevent the spread of infection.

Related pages

• Trichuriasis
• Nematode
• Parasitic worm

References

• Centers for Disease Control and Prevention. (2023). Trichuris trichiura. Retrieved from [1]
• World Health Organization. (2023). Trichuriasis. Retrieved from [2]

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  Male Trichuris trichiura
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  Female Trichuris trichiura
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  Life cycle of Trichuris trichiura
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  Cross-section of whipworm on microscopy
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  Trichuris trichiura eggs, including HE stain