Malignant catarrhal fever in cattle in Rio Grande do Sul, Brazil: epidemiology, clinical signs and pathology

Pesquisa Veterinária Brasileira

Oliveira, Fabiano N.²  Schild, Ana Lucia¹  Driemeier, David³  Garmatz, Shana L.²  Rech, Raquel R.²  Riet-Correa, Franklin⁴  Barros, Claudio S.L.⁵ 

[1] Universidade Federal de Pelotas, Pelotas;Universidade Federal de Santa Maria (UFSM);Universidade Federal do Rio Grande do Sul, Porto Alegre;Universidade Federal de Campina Grande, Patos;UFSM, Santa Maria

关键词: Infectious diseases;    epidemiology;    viral diseases;    diseases of cattle;    pathology.;   

DOI  :  10.1590/S0100-736X2005000200006

来源: Colegio Brasileiro de Patologia Animal-CBPA

【 摘 要 】

The epidemiology, clinical signs, necropsy and histopathological findings in cases of malignant catarrhal fever (MCF) occurring in cattle from 15 farms in Rio Grande do Sul, Brazil, from 1973 to 2003, are described. In 9 instances (60%) the disease occurred as sporadic cases affecting 1-3 cattle whereas in six farms (40%) MCF occurred as epizootics involving several cattle in each affected herd. Morbidity rates ranged from 2.4% to 20% and lethality rates were 83.3% and 100%. Cattle of all ages and both sexes were affected. Where the information was available (9 farms) sheep were in contact with affected cattle and cases of MCF occurred more frequently in spring and summer. Clinical courses were acute or subacute and clinical signs included fever, nasal and ocular discharges, conjunctivitis, drooling, hematuria, necrosis and blunting of buccal papillae, enlargement of lymph nodes, diarrhea and neurological disturbances. Necropsy findings included opaque corneas, reddening, erosions and ulcerations in several mucous membranes of the alimentary, respiratory and urogenital tracts, and the conjunctiva; enlargement and haemorrhage of lymph nodes and multiple white foci in the renal cortices and in the hepatic portal triads. Crustous dermatitis was observed in some cases. Main histopathological findings included vasculitis, necrosis of the surface epithelia and accumulation of inflammatory cells in several organs. Vasculitis were associated with fibrinoid necrosis of the medial layer of arteries and inflammatory cells included lymphoblasts, lymphocytes, plasma cells and macrophages. Index

【 授权许可】

CC BY-NC