n. a genus of widely distributed nonbloodsucking flies, occurring wherever sheep and goats are raised. The parasitic larvae of O. ovis, the sheep nostril fly, may occasionally and accidentally infect humans. By means of large mouth hooks, it attaches itself to the conjunctiva of the eye, causing a painful *myiasis that may result in loss of sight. This is an occupational disease of shepherds. Larvae can be removed with forceps following anaesthesia.
n. an infestation of a living organ or tissue by maggots. The flies normally breed in decaying animal and vegetable matter; myiasis therefore generally occurs only in regions of poor hygiene, and in most cases the infestations are accidental. Various genera may infect humans. *Gasterophilus, *Hypoderma, *Dermatobia, and Cordylobia (see tumbu fly) affect the skin; Fannia invades the alimentary canal and the urinary system; *Phormia and *Wohlfahrtia can infest open wounds and ulcers; *Oestrus attacks the eyes; and Cochliomyia invades the nasal passages. Treatment of external myiases involves the destruction and removal of maggots followed by the application of antibiotics to wounds and lesions.... myiasis