Theileriases or Theileriosis are tick-borne protozoal parasites that multiply in lymphocytes and then enter erythrocytes. theileriosis is common in tickinfested areas throughout the world. T. parva (East Coast fever, ECF), transmitted by Rhipicephalus appendiculatus, is a serious problem restricted to Central and East Africa. T. annulata, transmitted by Hyalomma species, occurs in North Africa, southern Europe, the Middle East, India, and Asia. Its pathogenicity varies but can result in mortality rates up to 90%. In 12.48, the Jersey heifer from Zimbabwe is in poor condition and shows gross enlargement of the parotid and prescapular lymph nodes, a rough coat (particularly dorsally), and matted hair over the face due to epiphora. Affected animals are pyrexic and anemic. On autopsy examination, splenic enlargement, severe pulmonary emphysema and edema, and generalized lymphoid hyperplasia are the most striking changes.
Posted on: Wed, 24 Sep 2014 08:08:03 +0000
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