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A 21-year-old woman presented to our hospital with the sensation of something moving in her eye. She reported having no systemic or visual symptoms. Her medical history was notable only for a trip abroad to Nigeria 6 years earlier. On examination, a live worm, 2 cm in length, was seen in the superior subconjunctival space of the left eye (see the video, available at NEJM.org). It was removed (see video) and identified as a male Loa loa worm. Blood testing revealed microfilaremia and antifilarial antibodies. The patient received systemic therapy with corticosteroids and diethylcarbamazine. L. loa is a nematode whose . . .