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Naturally occurring infections of cattle with Theileria lestoquardi and sheep with Theileria annulata in the Sudan
Authors:KM Taha  DA Salih  AM Ali  RA Omer  AM El Hussein
Institution:1. Atbara Veterinary Research Laboratory (AVRL), P.O. Box 121, Atbara, Sudan;2. Kassala Veterinary Research Laboratory (KVRL), P.O. Box 237, Kassala, Sudan;3. Faculty of Veterinary Medicine, University of Khartoum, Sudan;4. Veterinary Research Institute, P.O. Box 8067, Khartoum, Sudan;5. Animal Resources Research Corporation, P.O. Box 610, Khartoum, Sudan
Abstract:Theileria annulata is endemic in northern Sudan, hindering all efforts at upgrading cattle for milk production. T. lestoquardi clinical cases occur throughout the year and causes annual outbreaks that result in substantial losses in sheep. In the northern Sudan both cattle and small ruminants are frequently raised together and/or share common grazing grounds at river banks. In an attempt to evaluate field cross infectivity of Theileria lestoquardi and T. annulata in cattle and sheep respectively, a PCR analysis was carried out on samples collected from closely reared sheep and cattle using both T. annulata and T. lestoquardi specific primers. A total of 19 sheep out of 51 (37.3%) were positive for T. lestoquardi while four sheep (7.8%) showed T. annulata specific amplicons. A total of 38 out of 52 (73.1%) surveyed cattle were PCR positive for T. annulata and only two (3.8%) showed T. lestoquardi specific bands. These findings indicate complex epidemiology of both infections in areas where both parasites are transmitted by the same vector and call for further investigations of this phenomenon.
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