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A 53-year-old woman presented with a 3-week history of conjunctival redness, swelling, and the sensation of having a foreign body in the lateral conjunctiva of her left eye (arrow). She had traveled to Sri Lanka 10 months before presentation. Examination revealed a solitary, subconjunctival, moving worm (Panel A; see also video, available at NEJM.org). There was no evidence of intraocular or visceral involvement. Complete resolution was achieved after the surgical removal of the parasite (Panel B), which was 10 cm long. Dirofilaria repens is a zoonotic filarial nematode affecting dogs and other carnivores in Africa, Asia, and southern Europe. Microfilariae . . .