A severe epizootic of bovine malignant catarrh occurred from November 1976 until June 1977 in cattle at an agricultural institute in peninsular Malaysia. In a group of 82 Kedah-Kelantan cattle the morbidity rate was 47.6 per cent with a fatality rate of 89.7 per cent. In a group of 43 local Indian dairy cattle the morbidity rate was 23.3 per cent with a fatality rate of 100 per cent. Although evidence suggested that sheep acted as a common source of infection, the disease occurred in one animal which had no contact with sheep but had contact with infected cattle and carcases.