Outbreak of Oestrus ovis in sheep in Mato Grosso, Brazil

Schenkel D. M., Cavalcante M. K. M., Damasceno E. S., Campos A. K. & Furlan F. H. 2012. [Outbreak of Oestrus ovis in sheep in Mato Grosso, Brazil.] Surto de Oestrus ovis em ovinos em Mato Grosso. Pesquisa Veterinaria Brasileira 32(8): 754-756. Laboratorio de Patologia Animal, Hospital Veterinario, Campus Universitario de Sinop, Universidade Federal de Mato Grosso, Avenida Alexandre Ferronato 1200, Sinop, MT 78557-287, Brazil. E-mail: furlan@ufmt.br Oestrus ovis is a cosmopolitan agent of myiasis in sheep and goats. The parasitic phase begins after adult females deposit first stage larvae into the nostrils of hosts. The aim of this study was to describe the epidemiological data, clinical signs, gross and microscopical findings of an outbreak of O. ovis myiasis in sheep in state of Mato Grosso. Sneezing and nasal discharges was the major clinical signs in infected sheep. The main gross findings include hyperemia and oedema of the nasal mucosa. At the microscopic exam there was moderate infiltration of mast cells and eosinophils in the nasal mucosa with moderate to severe oedema and hyperemia. Although affecting a large number of sheep, the mortality occurred due to other causes such as Haemonchus contortus infection and pneumonia.