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Which one of the following best describes the ectoparasite that causes pediculosis pubis?

The adult crab louse (<em>Phthirus pubis</em>) is 1 to 2 mm in length and has 6 legs; the two front legs stand out as much larger and look like the pincer claws of a crab. Some have described the pubic louse as resembling a miniature crab, hence the name crabs.
Figure 1. Adult Crab Louse (Phthirus pubis)
The adult crab louse (Phthirus pubis) is 1 to 2 mm in length and has 6 legs; the two front legs stand out as much larger and look like the pincer claws of a crab. Some have described the pubic louse as resembling a miniature crab, hence the name crabs.
Illustration by Jared Travnicek, Cognition Studio
Adult female insects lay eggs (nits) that adhere to the hair-skin junction. The nits hatch in approximately 6 to 10 days and mature from the nymph stage to adult stage within 10 days.
Figure 2. Life Cycle of Crab Louse
Adult female insects lay eggs (nits) that adhere to the hair-skin junction. The nits hatch in approximately 6 to 10 days and mature from the nymph stage to adult stage within 10 days.
Illustration by Jared Travnicek, Cognition Studio
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Question Last Updated
March 11th, 2025

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