Five geese flocks were surveyed to gather data on the prevalence and clinical manifestation of traumatic myiasis and the fly species involved. Myiasis was recorded in all the flocks and the total number of infested geese was 26 (ca. 0.1% of the total numbers). The first cases were observed at the end of May, the last ones in August. Most birds (16/26) were infested in August. Each affected goose had only one lesion, which was located more frequently on the wings (14/26) than on any other body. In seven geese, Wohlfahrtia magnifica (Diptera: Sarcophagidae) was the only myiasis-causing species. In these cases the detransformed mean number of larvae per wound was 18.1 (range 5-40). Lucilia sericata (Diptera: Calliphoridae) was found to be solely responsible for the lesions of 12 birds, with detransformed mean of 94.0 (range 2-893) larvae per goose. The larvae of this species appeared to be generally less invasive than those of W. magnifica, but in three cases they were also deeply embedded in the wounds. In seven geese larvae of both fly species developed together in and around the wounds. With the exception of one lesion, there were more larvae of W. magnifica (detransformed mean of 21.8 with a range of 1-55) than that of L. sericata (detransformed mean of 11.2 with a range of 2-61) in these mixed infections. Predisposing conditions for development of traumatic myiasis in geese included plucking of feathers, other injuries and bacterial infections (e.g. inflammation of the phallus).
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