After being bitten by an infected tick E. ruminantium enters the animal in the saliva of the tick. Initial multiplication of the parasiteprobably takes place in cells of the lymph node regional to the tick bite from where it enters the blood stream and invades endothelial cells in various tissues and organs. Increased vascular permeability resuylts in transudation of fluid into various body tissues (e.g. brain and lungs) and body cavities (e.g. pericardial and thoracic cavities), but the precise mechanisms responsible for the transudation are poorly understood. Pathology: the lesions in cattle, sheep and goats are similar, the most pronounced being often severe hydropericardium, hydrothorax and lung oedema with serofibrinous foam being present in the bronchi and trachea. These images illustrated a severe case. (Source: Allsopp, BA, Bezuidenhout, JD & Prozesky, L 2004, 'Heartwater', in Coetzer, JAW & Tustin, RC, Infectious diseases of livestock, Cape Town, Oxford University Press, 2004)
Photo 1: Color photo. Original document size: (w)7 x (h)4.64 cm. Original scanned size: 270 kb JPEG, 600 dpi. Final web-ready size: 38.7 kb. Estimate download time: 15 sec. @ 28.8 kbps. Original TIFF file housed at the Dept. Veterinary Tropical Diseases, University of Pretoria.
Photo 2: Color photo. Original document size: (w)7 x (h)4.64 cm. Original scanned size: 298 kb JPEG, 600 dpi. Final web-ready size: 35.76 kb. Estimate download time: 14 sec. @ 28.8 kbps. Original TIFF file housed at the Dept. Veterinary Tropical Diseases, University of Pretoria.
Metadata assigned by Prof. R.C. Tustin, Professor Emeritus: DVTD. His academic and professional experience includes: veterinarian for 54 years,
senior lecturer at UP for 7 years, head of Department at UP for 17 years and Veterinary Council for 3 years.