The infective larvae of the parasite S. stercoralis penetrate the skin and migrate through the circulatory system to the heart and lungs. The organism enters the bronchial tree and is then swallowed, entering the digestive tract, where the organism matures into an adult worm. This parasite is classified as which type of infection?
a. Pinworm
b. Threadworm
c. Whipworm
d. Hookworm
B
Infection with S. stercoralis is less common than with other intestinal nematodes. S. stercoralis, commonly referred to as the threadworm, may inhabit the intestine or exist as a free-living or-ganism in the soil. The life cycle can be classified as direct, indirect (free-living phase), or au-toinfective
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