Spatial analysis of Leishmania donovani exposure in humans and domestic animals in a recent kala azar focus in Nepal

B Khanal, A Picado, NR Bhattarai, G Van der Auwera, ML Das, B Ostyn, CR Davies, M Boelaert, JC Dujardin, S Rijal

    Research output: Contribution to journalA1: Web of Science-article

    Abstract

    SUMMARY Visceral leishmaniasis (VL) is a major public health problem in the Indian subcontinent where the Leishmania donovani transmission cycle is described as anthroponotic. However, the role of animals (in particular domestic animals) in the persistence and expansion of VL is still a matter of debate. We combined Direct Agglutination Test (DAT) results in humans and domestic animals with Geographic Information System technology (i.e. extraction maps and scan statistic) to evaluate the exposure to L. donovani on these 2 populations in a recent VL focus in Nepal. A Poisson regression model was used to assess the risk of infection in humans associated with, among other factors, the proportion of DAT-positive animals in the proximities of the household. The serological results showed that both humans and domestic animals were exposed to L. donovani. DAT-positive animals and humans were spatially clustered. The presence of serologically positive goats (IRR=9.71), past VL cases (IRR=2.62) and the proximity to a forest island dividing the study area (IRR=3.67) increased the risk of being DAT-positive in humans. Even if they are not a reservoir, domestic animals, and specially goats, may play a role in the distribution of L. donovani, in particular in this new VL focus
    Original languageEnglish
    JournalParasitology
    Volume137
    Issue number11
    Pages (from-to)1597-1603
    Number of pages7
    ISSN0031-1820
    DOIs
    Publication statusPublished - 2010

    Keywords

    • B780-tropical-medicine
    • Protozoal diseases
    • Leishmaniasis
    • Visceral
    • Kala azar
    • Leishmania donovani
    • Vectors
    • Phlebotomus argentipes
    • Sandflies
    • Reservoirs
    • Domestic animals
    • Buffaloes
    • Cattle
    • Goats
    • Disease transmission
    • Transmission dynamics
    • Exposure
    • Detection
    • Direct agglutination test
    • DAT
    • Risk assessment
    • Risk factors
    • Nepal
    • Asia-South

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