Fachbereich Veterinärmedizin



    Insecticide-treated mosquito fences protect pigs against tsetse-transmitted trypanosomes in the Suhum district, Ghana, West Africa (2008)

    Holzgrefe, B.
    Mahama, C.
    Dotcher, E.
    Mehlitz, D.
    Clausen, P-H
    Bauer, B.
    23. Jahrestagung der Deutschen Gesellschaft für Parasitologie
    Hamburg, 05. – 07.03.2008
    Institut für Parasitologie und Tropenveterinärmedizin

    Robert-von-Ostertag-Str. 7-13
    Gebäude 35, 22, 23
    14163 Berlin
    Tel.+49 30 838 62310 Fax.+49 30 838 62323

    Abstract / Zusammenfassung

    Tsetse-transmitted African Animal Trypanosomosis (AAT) constitutes a main constraint to livestock industries in sub-Saharan Africa, causing reduced productivity/fertility and death without treatment. Control strategies comprise trypanocidal drug use and reduction of vector populations (Glossina spp) by various methods. Vector control methods are successful but unsustainable resulting in rapid reversal of achievements after external support termination. This study evaluated an innovative approach to control Glossina palpalis palpalis using deltamethrin-treated mosquito fences protecting pig pens, finally reducing trypanosome prevalence. The 100cm high fence consists of polyester, 150denier, impregnated with deltamethrin (100mg/m2). Two villages (Kwesikonfo, A ? intervention; Zorh, B ? control) with comparable pig numbers, husbandry practices, vegetation, surface water and climate (tropical rain forest zone) were selected. All pigs were treated with 3.5mg/kg diminazene aceturate once protection had been deployed. Apparent densities of tsetse were monitored using geo-referenced biconical traps (10/village). Tsetse catches in A were reduced by more than 90% within two months and remained at this level until termination, whereas they appeared unaffected in B (control). Trypanosome infections (blood smears or PCR) were assessed for six months during intervention. Pre-intervention infections rates of pigs were 76% (A) and 72% (B), respectively. Following trypanocidal treatment and onset of intervention, trypanosome infection rates were 16% and 8% (3 and 6 months after treatment) in protected pigs contrasting with 86% and 60% in control pigs. Insecticide-treated fences surrounding pig pens significantly reduced trypanosome risk. During this year?s meeting the ISCTRC (International Scientific Council for Tyrpanosomiasis Research and Control) has appraised the technique as novel and probably sustainable approach for tsetse control recommending it for further application and evaluation in different ecological settings