Abstract
Clustered cases of Oestrus ovis ophthalmomyiasis after 3-week festival, Marseille, France, 2013.
Highlights
The larva of the sheep bot fly, Oestrus ovis L., is a parasite that lives on mucous surfaces of the nasal passages and sinuses of sheep and goats
Fertile eggs hatch within the female fly, and she deposits newly hatched larvae in the nostrils of the host
In southern areas of the United States where winters are moderate, adult flies are active during all but the very coldest months, and larvae continue to develop within the host during winter
Summary
The larva of the sheep bot fly, Oestrus ovis L., is a parasite that lives on mucous surfaces of the nasal passages and sinuses of sheep and goats. It has been estimated that sheep bot fly larvae cause a 4 percent decrease in weight gain. Drummond in 1981 estimated annual losses in sheep production in the United States due to sheep bot fly to be $13.5 million. An external sign of infestation is the appearance of a slightly to moderate runny nose (Figure 1); this condition increases in severity as the infestation develops
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