Abstract
Trypanosomes are protozoan parasites of class Kinetoplastida. Trypanosoma vivax is one of the organisms that can cause Nagana and Trypanosoma evansi can cause Surra. In Africa, Trypanosoma vivax is mainly transmitted by Glossina spp. (tsetse fly) but it can be transmitted mechanically by other blood-feeding dipters. Trypanosoma evansi is transmitted mechanically and non-dependent to tsetse fly. In this research, T. vivax and T. evansi among camels (Camelus dromedarius) in Yazd, Iran were identified by microscopy and molecular examinations but the sensitivity of microscopy was lower than molecular examinations. Trypanosoma vivax and T. evansi were observed in 4 out of 134 blood film samples (2.98%). The prevalence of Trypanosoma spp. among 134 male camels (C. dromedarius) based on molecular examinations was 30.6% (22.76-38.44% with 95% confidence interval), 25 out of 134 (18.65%) had co-infection of T. evansi and T. vivax, and 16 out of 134 (11.94%) had an infection of T. vivax alone. We provided the first confirmation of infection with T. vivax among camels in Iran, and also in Asia, which has important implications on our knowledge of the occurrence and possible spread of this pathogen at the global level. Investigations in other species such as cattle and sheep are strongly recommended.
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