Dermatite alérgica sazonal em ovinos deslanados no nordeste do Brasil

Abstract

Pesq. Vet. Bras. 32(6) The skin of the affected sheep was whitish, irregularly thickened, with alopecia, crusts, and intense pruritus. Those lesions were localized more frequently in the head (ears and periocular and frontal regions) but in some animals the dorsum and croup were also affected. Histologic lesions of the epidermis were hyperkeratosis, acanthosis, hypergranulosis, and moderate spongiosis. The dermis showed inϐiltration by eosinophils, macrophages and plasma cells, mainly perivascular. The hair follicles showed keratosis and the sudoriparous glands were dilated. No changes were observed in the differential blood count. In April and June 2010 insects were captured by the use of CDC light trap. Forty three out of 110 dipterous captured were identiϐied as Culicoides insignis Lutz. It is concluded that the disease is a seasonal allergic dermatitis associated with C. insignis bites. A pele apresentava lesões alopécicas, crostosas, enrugadas, esbranquiçadas e com intenso prurido, localizados na região da cabeça (orelhas, ao redor dos olhos e região frontal), região dorsal do corpo e garupa. Histologicamente, a epiderme apresentou hiperqueratose, acantose, hipergranulose e moderada espongiose. Na derme havia

Allergic dermatitis caused by Culicoides in Texel sheep in the state of Pará, Brazil

“…In the present study, the lesions were located in the ears, around the eyes, on the top of the head, and in the nose, which is similar to the observations in other outbreaks (Connan & Lloyd 1988, Yeruham & Braverman 2000, Yeruham et al 2004, Corrêa et al 2007, Souza et al 2005, Portela et al 2012. Lesions in the lower abdomen (Corrêa et al 2007, Souza et.…”

“…al. 2005, dorsal region of the body, rump (Portela et al 2012), udder, and distal portion of the limbs (Souza et al 2005) have also been described but were not observed in the present study. The location of these lesions matches the regions chosen by insects during blood feeding.…”

“…Reports of seasonal allergic dermatitis outbreaks in sheep caused by Culicoides spp. have been documented by several authors (Schild et al 1993, Yeruham & Braverman 2000, Corrêa et al 2007, Portela et al 2012). In Israel, C. obsoletus is responsible for all cases of this disease in sheep (Yeruham & Braverman 2000).…”

“…Seasonal allergic dermatitis is a skin disease that is associated with insect bites and affects several animal species, including horses (Henry & Bory 1937, Baker & Quinn 1978, Fadok & Greiner 1990, Schild et al 2003, Oliveira-Filho et al 2012, sheep (Connan & Lloyd 1988, Schild et al 2003, Corrêa et al 2007, Souza et al 2005, Barbosa et al 2011, Portela et al 2012, cattle (Yeruham et al 1993), mules, goats (Yeruham et al 1997, Macêdo et al 2008, felines (Mason & Evans 1991), and man (Penneys et al 1989, Brummer-Korvenkontio et al 1994.…”

“…In the state of Rio Grande do Norte, Portela et al (2012) described the disease in a herd with 40 Santa Inês sheep that were raised extensively on natural pasture. The morbidity rate reached 32.5%.…”