This photomicrograph reveals an egg from the nematode Trichuris trichiura; Mag. 400X.
The female T. trichiura worms begin to oviposit in the cecum and ascending colon, 60 to 70 days after infection. Female worms in the cecum shed between 3,000 and 20,000 eggs per day. The life span of the adults is about 1 year.
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Some of the images on this website are in the public domain.