High Mortality Rate due to False Gid in a Sheep Herd

Abstract

The sheep nasal bot, Oestrus ovis (Diptera: Oestridae), is a cosmopolitan parasite commonly found in sheep and occasionally goats. Rarely a bot will migrate into the sheep brain (false gid). Following the complaint of an animal husbandman about high mortality rate in a sheep herd, the herd was clinically, hematologically, and pathologically examined exactly. Clinical, hematological, and pathological findings were described in the text. Necropsy findings showed heavy infestation with Oestrus ovis larvae. The herd was treated with Ivermectin. After treatment all patients without nervous sings were recovered. Patients with nervous signs did not respond to treatment, but new cases of disease did not occur and the mortality stopped. In the present report, a high mortality rate due to false gid in a sheep herd was described. The prevention and control of the disease are important because of economic losses and the possibility of transmission to the human.

Oestrus ovis infection of grazing sheep during summer in southern Chile

“…This is expressed as rhinitis with an overproduction of mucus, which promotes the feeding of Oestrus ovis infection of grazing sheep during summer in southern Chile 1 the larvae. Some animals may present a serious infection when the larvae enter the brain through the foramina and they may develop encephalitis, manifesting ataxia, hemiparesis and blindness (Mozaffari et al 2013). Severe injury of the brain tissue may produce a characteristic behavior in sheep known as "gid" which resembles the lesion produced by Coenurus cerebralis, the larval stage of Taenia multiceps (Anwar et al 2013).…”

The complete mitochondrial genome of Oestrus ovis (Linnaeus, 1758) (Diptera: Oestridae)

“…The family Oestridae includes 29 genera grouped into four subfamilies with about 170 species (Scholl et al 2019). Oestrids are obligate parasites in their larval phases, their infestations can increase the likelihood of opportunistic infections and in severe cases can lead to head injury and even death of the host (Mozaffari et al 2013). In this study, we sequenced and analyzed for the first time the complete mitochondrial genome of Oestrus ovis.…”

Prevalence and Associated Risk Factors of Ovine Oestrosis in Dendi District of Central Ethiopia

“…Oestrosis in small ruminants causes substantial economic losses to sheep and goat producers. 6 , 7 The pathogenic effects cause a reduction in production and serious economic losses, which have been estimated at 1.1–4.6 kg of meat, 200–500 g of wool, and up to 10% of milk per animal. 2 Mozaffari et al 7 also reported a 10% mortality rate of sheep with O. ovis infestation.…”

“… 6 , 7 The pathogenic effects cause a reduction in production and serious economic losses, which have been estimated at 1.1–4.6 kg of meat, 200–500 g of wool, and up to 10% of milk per animal. 2 Mozaffari et al 7 also reported a 10% mortality rate of sheep with O. ovis infestation. Besides, oestrosis has public health significance.…”