Resistance to diminazene aceturate and isometamidium chloride in South American T. vivax and T. evansi: consequences on treatment and chemoprophylaxis

Desquesnes Marc, Tresse Laurent. 1999. Resistance to diminazene aceturate and isometamidium chloride in South American T. vivax and T. evansi: consequences on treatment and chemoprophylaxis. In : Proceedings of first symposium on new world trypanosomes = [Actes du 1er symposium sur les trypanosomes d'Amérique]. Vokaty S. (ed.), Desquesnes M. (ed.). Bridgetown : IICA, pp. 128-138. Symposium on New World Trypanosomes. 1, Georgetown, Guyana, 20 November 1996/22 November 1996.

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Autre titre : Résistance des T. vivax et T. evansi Sud américains à l'acéturate diminazène et au chloride isométamidium : conséquences sur les traitements et la chimioprophylaxie

Abstract : Little information is available on the sensitivity of Latin American isolates livestock of trypanosomes to trypanocides. Resistance to diminazene aceturate and isometamidium chloride was evaluated in sheep and calves for 3 isolates of #T.vivax# from French Guyana, 1 from Venezuela and 1 isolate of #T. evansi# from Venezuela. Whichever treatment was applied, parasites were no longer detectable the day after the treatment. All the isolates were resistant to diminazene at the dose of 7mg/Kg except one isolate from French Guyana; relapses were recorded 12 to 150 days after the treatments. Sheep were shown to be potentially healthy carriers of #T. vivax# and #T. evansi#. Resistance was not recorded to the treatment with 0,5 mg/Kg isometamidium chloride in #T. Vivax# infected sheep; duration of the protection was evaluated in some of the animals by re-inoculation of the same isolates after every 15 days; the animals protected for more than 4.5 monthes. In #T. evansi# infections, although the infections could not be ascertained, either by direct examination of by mice inoculations, the antibody level appredated by indirect-ELISA #T. evansi# had not decrease 4 monthes after the treatment; it is suggested that this isolate of #T.evansi# is resistant to isometamidium chloride. The use of diminazene aceturate and isometamidium in enzootic and epizootic, monospecific or multispecific situations is discussed, and is opposed to the strategy generally applied in Africa. The role of reservoir of ruminant and dogs for #T. evansi# and eventually of horses for #T. vivax# is recalled.

Mots-clés Agrovoc : Trypanosoma vivax, Trypanosoma evansi, Antiprotozoaire, Résistance aux produits chimiques, Chimioprévention, Contrôle de maladies

Mots-clés géographiques Agrovoc : Amérique du Sud

Classification Agris : L72 - Pests of animals
L73 - Animal diseases

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