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An outbreak of Malignant Catarrhal Fever (MCF) resulted in death of five female buffaloes and one domestic cow from the same farm. Four buffaloes died 10-15 days after the appearance of clinical signs, while the fifth was euthanized in extremis, after similar clinical signs. Histopathological lesions included multifocal histiolymphocytic epicarditis, myocarditis and lymphocytic interstitial pneumonia, which are commonly seen in cases of MCF in buffaloes. Furthermore, lymphocytic vasculitis centered in the adventitia, with occasional fibrinoid necrosis in the muscular layer, was found in the kidneys, liver, spleen, lymph nodes and brain. Nucleotide sequencing of DNA fragments from the central nervous system amplified by PCR revealed 98% similarity with known OHV-2 sequences from Genbank. Additionally, PCR analysis also revealed the presence of OHV-2 DNA in the peripheral mononuclear blood cells of two clinically healthy buffaloes. The diagnosis of MCFwas based on epidemiological, clinical, gross and histopathological findings and on the results of a semi-nested PCR followed by nucleotide sequencing. É relatado um surto de febre catarral maligna (FCM) em Minas Gerais, que resultou na morte de 5 búfalas e uma vaca de uma mesma propriedade. Quatro búfalas morreram com 10-15 dias após o início dos sinais clínicos e uma búfala foi sacrificada in extremis, após manifestar sinais clínicos semelhantes. O exame histopatológico revelou lesões comumente observadas em búfalos com FCM como epicardite e miocardite histiolinfocítica multifocal e pneumonia linfocítica intersticial. Além disso, vasculite linfocítica, principalmente na camada adventícia, com necrose fibrinóide da camada muscular, foi observada no rim, fígado, baço, linfonodos e cérebro. A seqüência de nucleotídeos amplificada pela técnica de PCR revelou 98% de homologia entre o fragmento de DNA amplificado da amostra do sistema nervoso central (SNC) da búfala com seqüências de OHV-2 previamente depositadas no Genbank. Adicionalmente, a técnica de PCR revelou a presença do DNA viral no sangue total de 2 búfalas, clinicamente sadias. O diagnóstico de FCM foi baseado em dados epidemiológicos, clínicos, patológicos, histopatológicos e semi-nested PCR

An outbreak of malignant catarrhal fever in Murrah buffaloes in Minas Gerais, Brazil