Trichuris trichiura

Worldwide, with infections more frequent in areas with tropical weather and poor sanitation practices, and among children.  It is estimated that 800 million people are infected worldwide. 

Los huevos típicos de Trichuris trichiura
miden 50-55 μm por 22-24 μm ,
tienen una cubierta parda y lisa con
prominencias (tapones) bipolares y contienen
un ovum monocelular

Trichuris muris - the mouse whipworm is a useful parasite model of the human parasite - Trichuris trichuria. Whipworms derive their name from their characteristic morphology. Adults occupy the large intestine with their anterior ends embedded in the cells lining the intestine. Transmission occurs by ingestion of contaminated material

Infection occurs by the ingestion of embryonnated eggs. L1 larvae hatch in the caecum and penetrate the mucosal epithelium. 9-11 days after infection the larvae moult to the L2 stage. 17 days post infection, the larvae moult again to the L3 stage. 5 days later L3 moult to L4 and at day 29 post infection, the L4 larvae moult for the last time to produce the mature adult. At this stage the posterior end of the worm protrudes into the gut lumen. The adults mate and females produce eggs which get expelled with the hosts faeces

LINKS

www.msu.edu/
user/keasbria

Balantidium coli

Life cycle

Trophozoites

Entamoeba histolytica

• Life cycle
• Trophozoite
• Cyst

Entamoeba coli

• Trophozoite
• Cyst

Iodamoeba buetschlii

• Cyst

Endolimax nana

• Trophozoite
• Cyst

• Naegleria fowleri

JS

Trichuris trichiura: Trichuris four cells.-	Trichuris trichiura: detail of bipolar prominences.

The unembryonated eggs are passed with the stool. In the soil, the eggs develop into a 2-cell stage, an advanced cleavage stage, and then the eggs embryonate. The eggs become infective in 15-30 days. After ingestion (soil-contaminated hands or food), the eggs hatch in the small intestine and release larvas that mature and establish themselves as adults in the colon. The adult worms (approximately 4 cm in length) live in the cecum and ascending colon. The adult worms are fixed in that location with the anterior portions threaded into the mucosa. The females begin to oviposit 60-70 days after infection. Female worms in the cecum shed between 3,000-20,000 eggs per day. The life span of the adults is about 1 year.Most cases are asymptomatic. Heavy parasite loads cause diarrhea and pain. Diagnosis of stools is often aided by concentration techniques with a centrifuge

SOURCE

• www.cdfound.to.it

• www.shinpoong.co.kr

• www.ufrgs.br/para-site

• Animalia/Trichuris

• www.pitt.edu/

• http://www.nematode.net/Species.Summaries/Trichuris.vulpis/index.php

Human Parasitic Nematode Links

http://freehomepages.com/misalud/bacteria3.html