Читать книгу Farm Animal Medicine and Surgery - Graham R Duncanson - Страница 185

This tropical or subtropical tick-borne disease follows 10 days after exposure to infected ticks so weekly dipping or spraying with acaricide will normally prevent the disease. The most important type is East Coast fever (ECF) which is found in East and Central Africa. ECF is caused by Theileria parva parva and is spread by Rhipicephalus appendiculatus. ECF has a high morbidity and a high mortality. There is a less virulent strain of the parasite, T. p. bovis. T. p. lawrencei causes a similar disease but can only be spread from buffalos to cattle but not from ox to ox. The main presenting signs for all types of theileriosis are high fever and swollen peripheral lymph nodes. Diagnosis can be confirmed by seeing Koch’s blue bodies in lymph node smears. Treatment with buparvaquone is very effective if given in the early stages of the disease. An immunization using an infection-and-treatment regime is used in some areas of East Africa.