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Medical Definition of Malignant catarrhal fever
1. A highly fatal, sporadic disease of cattle caused by alcelaphine herpesvirus 1 (a member of the Herpesviridae family) and characterised by inflammation, ulceration, and exudation of the oral and upper respiratory mucous membranes, and sometimes eye lesions and nervous system disturbances. Synonym: malignant catarrh of cattle. (05 Mar 2000)