1929Handbk for Farmers (Dept of Agric.) 243In a second form, termed ‘Dikkop’, the heart is principally affected...This form is not as fatal as the ‘Dunkop’ or lung form, which starts with high fever and general symptoms of illness.
1957Handbk for Farmers (Dept of Agric.)III. 427Sir Arnold Theiler distinguished four clinical forms of horsesickness, viz...Horsesickness fever,..the lung form (dunkop horsesickness), the heart form (dikkop horsesickness) and..the mixed form.
1974R. Clark inStd Encycl. of Sn Afr.X. 301In the ‘dunkop’ (thin-head) form there is massive effusion of fluid into the lungs.
1976Mönnig & VeldmanHandbk on Stock Diseases 71Dunkop, This is the most dangerous form of the disease...The lungs are attacked.
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