Which helminth is associated with pinworm infection in the U.S.?

Enterobius vermicularis is the helminth associated with pinworm infection, commonly found in the U.S. This parasite is characterized by its small, white appearance and is typically transmitted among children through the fecal-oral route. Infection occurs when eggs are ingested, often due to inadequate handwashing or contaminated surfaces.

The life cycle of Enterobius vermicularis involves the female worm laying eggs around the anal region, which can cause intense itching. This pruritus leads to scratching, allowing the eggs to be transferred to fingers, which can subsequently contaminate food or surfaces. The eggs can survive on surfaces for several weeks, contributing to the ease of transmission.

This particular helminth's prevalence in the U.S. is largely due to its efficient means of transmission and is considered the most common cause of enterobiasis, primarily affecting school-age children. As such, awareness and education about hygiene practices are critical to managing and preventing the spread of pinworm infections.