A 36-year-old man entered the emergency department with bleeding and weight loss several weeks after returning from a trip to South America. A stool sample was taken and microscopi-cally examined. Barrel-shaped eggs with bipolar plugs were observed. The organism can be identified as:
a. T. trichiura.
b. A. duodenale.
c. N. americanus.
d. S. stercoralis.
A
T. trichiura is typically found in moist, warm climates around the world. Infections are relatively common in Asia, Africa, and South America, with some cases identified in the southeastern United States. Eggs appear as brown barrel-shaped structures. They are unembryonated and con-tain a thick wall with hyaline polar plugs at each end
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