Migratory or creeping myiasis

Migratory or creeping myiasis is most often caused by the larvae of horse and cattle bot flies. Although Cuterebra usually cause furuncular myiasis in man, cases of migratory myiasis have been reported.G intestinalis, the horse bot fly, is the most frequent cause of human migratory myiasis. Once restricted to Europe the northwest coast of Africa, and Asia north of the Himalaya Moutains, G intestinalis is now, along with the horse widely distributed to almost all parts of the world. The adult G intestinalis is a brownish-yellow fly measuring 12 to 17 mm in length and resembles the honeybee in size, appearance, and the buzzing sound produced in flight. G intestinalis is only known to infest equids. Adult flies are only active during the summer months.