Which of the following symptoms is NOT commonly associated with enterobiasis caused by Enterobius vermicularis?

Enterobiasis, caused by the pinworm Enterobius vermicularis, is typically associated with several key symptoms. Anal itching is the most common complaint, resulting from the female worms laying eggs around the anal region, which can lead to significant discomfort. Patients often report this itching, especially at night, which can lead to insomnia—another known symptom of this infection.

Abdominal pain can occasionally be reported, although it is less common than anal itching and insomnia. Symptoms like persistent diarrhea are not characteristic of enterobiasis. While some gastrointestinal disruptions can occur, persistent diarrhea is generally not linked to this parasitic infection; instead, the symptoms are more localized and specific to the perianal area.

Given this understanding, persistent diarrhea stands out as a symptom that is not commonly associated with enterobiasis, highlighting the unique symptom profile of pinworm infections.