Polioencefalomalacia em bovinos nos estados de Mato Grosso do Sul e São Paulo

Pesquisa Veterinária Brasileira

Luciano Nakazato²  Ricardo A. A. Lemos¹  Franklin Riet-correa¹ 

[1] ,Universidade Federal de Mato Grosso Faculdade de Agronomia e Medicina Veterinária Departamento de Clínica Médica Veterinária

关键词: Polioencephalomalacia;    cerebrocortical necrosis;    cattle;    thiamine;    salt;    Polioencefalomalacia;    necrose cerebrocortical;    bovino;    tiamina;    sal;   

DOI  :  10.1590/S0100-736X2000000300006

来源: SciELO

【 摘 要 】

Thirty outbreaks of polioencephalomalacia (PEM) were diagnosed from August 1993 to October 1997. Twenty nine occurred in the state of Mato Grosso do Sul and one in São Paulo. The disease affected cattle from 4 months to 7 years of age. Morbidity rates ranged from 0.02% to 14.28% and case fatalities from 42.5 % to 100%. The disease was not seasonal. All outbreaks occurred in cattle grazing Brachiaria spp, except one affecting feedlot cattle. Only neurologic signs were observed, and the course of the disease varied from 12 hours to 4 days in untreated cattle. Most animals treated with thiamine and dexamethazone recovered. Moderate cerebral edema was observed at necropsy. Cell changes were characterized by laminar necrosis and gitter cells. In two cases moderate cortical and submeningeal hemorrhages were observed. Nine cases had perivascular and submeningeal infiltrations by eosinophils. Sodium ion concentration of the cerebrospinal fluid was elevated in one case. The cause of PEM in the region was not determined, but the results suggest that in some cases sodium chloride intoxication/water deprivation could play a role in the etiology of the disease. PEM represents 4.78% of cattle disease diagnosed at the Pathology Laboratory of the Federal University of Mato Grosso do Sul.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License