title: Trypanosoma evansi and surra: a review and perspectives on origin, history, distribution, taxonomy, morphology, hosts, and pathogenic effects.
abstract: Trypanosoma evansi, the agent of "surra," is a salivarian trypanosome, originating from Africa. It is thought to derive from Trypanosoma brucei by deletion of the maxicircle kinetoplastic DNA (genetic material required for cyclical development in tsetse flies). It is mostly mechanically transmitted by tabanids and stomoxes, initially to camels, in sub-Saharan area. The disease spread from North Africa towards the Middle East, Turkey, India, up to 53° North in Russia, across all South-East Asia, down to Indonesia and the Philippines, and it was also introduced by the conquistadores into Latin America. It can affect a very large range of domestic and wild hosts including camelids, equines, cattle, buffaloes, sheep, goats, pigs, dogs and other carnivores, deer, gazelles, and elephants. It found a new large range of wild and domestic hosts in Latin America, including reservoirs (capybaras) and biological vectors (vampire bats). Surra is a major disease in camels, equines, and dogs, in which it can often be fatal in the absence of treatment, and exhibits nonspecific clinical signs (anaemia, loss of weight, abortion, and death), which are variable from one host and one place to another; however, its immunosuppressive effects interfering with intercurrent diseases or vaccination campaigns might be its most significant and questionable aspect.
authors.affiliation: Cirad-Bios, UMR-InterTryp, Montpellier 34000, France ; Faculty of Veterinary Medicine, Kasetsart University, Chatuchak, Bangkok 10900, Thailand.
authors.forename: Marc
authors.initials: M
authors.lastname: Desquesnes
authors.forename: Philippe
authors.initials: P
authors.lastname: Holzmuller
authors.forename: De-Hua
authors.initials: DH
authors.lastname: Lai
authors.forename: Alan
authors.initials: A
authors.lastname: Dargantes
authors.forename: Zhao-Rong
authors.initials: ZR
authors.lastname: Lun
authors.forename: Sathaporn
authors.initials: S
authors.lastname: Jittaplapong
mesh_terms: D017954:Africa South of the Sahara; D000818:Animals; D002020:Buffaloes / Q000276:immunology / Q000469:parasitology; D002417:Cattle; D004285:Dogs; D006041:Goats / Q000276:immunology / Q000469:parasitology; D006736:Horses / Q000276:immunology / Q000469:parasitology; D054884:Host-Pathogen Interactions / Q000235:genetics* / Q000276:immunology; D006801:Humans; D012756:Sheep / Q000276:immunology / Q000469:parasitology; D013045:Species Specificity; D013552:Swine / Q000276:immunology / Q000469:parasitology; D014345:Trypanosoma / Q000235:genetics* / Q000276:immunology / Q000472:pathogenicity*; D014352:Trypanosomiasis / Q000235:genetics* / Q000276:immunology / Q000473:pathology / Q000662:veterinary
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