Also known as: Equine eye worm
Intermediate hosts: Muscid flies
Definitive hosts: Horses
The female worms are viviparous. L1 is passed by the female worm, and is ingested by the fly, acting as the intermediate host. The L1 develop into L2, then into L3 inside the ovarian follicles of the fly. The fly infects the definitive host whilst feeding.
The prepatent period of T. lacrymalis is 3-6 weeks.
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