Canine thelaziosis is a nematode infection affecting the eyes and associated tissues. In dogs, two species of so-called ‘eyeworms’ have been described: Thelazia callipaeda (also named ‘oriental eyeworm’) and Thelazia californiensis. The disease is characterised by conjunctivitis and keratoconjunctivitis or even corneal ulcers. The vectors for the eyeworms are flies.

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