![]() ![]() In the present report, a high mortality rate due to false gid in a sheep herd was described. Patients with nervous signs did not respond to treatment, but new cases of disease did not occur and the mortality stopped. After treatment all patients without nervous sings were recovered. ![]() Necropsy findings showed heavy infestation with Oestrus ovis larvae. Clinical, hematological, and pathological findings were described in the text. Following the complaint of an animal husbandman about high mortality rate in a sheep herd, the herd was clinically, hematologically, and pathologically examined exactly. Rarely a bot will migrate into the sheep brain (false gid). The sheep nasal bot, Oestrus ovis (Diptera: Oestridae), is a cosmopolitan parasite commonly found in sheep and occasionally goats. The prevention and control of the disease are important because of economic losses and the possibility of transmission to the human. There is no report about false gid in the word up to now. ![]() ovis infestations in sheep in the world is as follows: 33.2–65% in France, 71.1% in Spain, 55.8–91.0% in Italy, 22.6% in Libya, 17.2% in Iraq, 8.7% in Egypt, 58% in Jordan, 5.5% in Saudi Arabia, 21.0% in Ethiopia, 10–100% in Morocco, 67.4% in Algeria, 6–52% in Zimbabwe, and 8.1% in India. Heavy infection can induce a condition known as false gid in which the affected animal becomes unthrifty and exhibits a lack of coordination and staggers around in circles. The migratory larvae penetrate and erode the dorsal turbinate bones, frontal sinuses, and occasionally the skull bones while entering into the cerebral cavity, causing false gid. There may be also erosion of the bones of the skull and damage to the brain, leading to blind staggers or false gid. Oestrus ovis is a problem of sheep and goat worldwide, as the larvae cause a serious mucopurulent myiasis of the nasal passages and frontal sinuses. The herd was treated with Ivermectin 1% (Ivectin, Razak Co., Tehran, Iran) at dose rate of 0.2 mg/kg bodyweight. ![]() In necropsy, the larvae were found in nasal passage, frontal sinuses, and brain ( Figure 3) and the nasal mucosa was hyperemic. Hematological examination including RBC, PCV, and total and differentiated WBC was also in normal range. Vital signs including temperature, heart, and respiratory rates were normal. In clinical examination, clinical signs such as sneezing, serosanguinous nasal discharge ( Figure 1), hyperemic nasal mucosa, depression ( Figure 2), circling, head pressing, aimless wandering, compulsive walking, blindness, and ataxia were observed. In the present report, a high mortality rate due to false gid in a sheep herd was described.įollowing the complaint of an animal husbandman about high mortality rate (10%) in a sheep herd, the herd was clinically, hematologically, and pathologically examined exactly. Clinical respiratory signs such as seromucous or purulent nasal discharge, frequent sneezing, and dyspnea may severely impair the health of affected animals. Clinical symptoms, depending on the infected area and larvae numbers, are different. The duration of this parasitic portion of the life cycle varies considerably from a few weeks to several months, depending on the season and climatic conditions. Larvae migrate to the frontal sinuses and complete two molts before returning to the nasal passages, from where they are expelled by sneezing. Adult flies deposit larvae in or near the sheep's nostrils and the first instars move into the nasal passages where they feed on nasal secretion. The disease has a higher prevalence in tropical areas. ![]()
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