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Dengue in the Seychelles

C H Calisher, M Nuti, J S Lazuick

    Bulletin of the World Health Organization
    |January 1, 1981
    PubMed
    Summary
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    Dengue virus epidemics in the Seychelles were primarily caused by Dengue 2. This study also identified chikungunya and Sindbis viruses, marking the first evidence of these alphaviruses in the region.

    Area of Science:

    • Medical Entomology
    • Virology
    • Epidemiology

    Background:

    • The Seychelles experienced dengue-like illness epidemics between 1976-1977 and 1978-1979.
    • Dengue virus serotype 2 (DENV-2) was previously isolated from individuals in the Seychelles in 1977.

    Purpose of the Study:

    • To investigate the etiological agents responsible for dengue-like illness epidemics in the Seychelles.
    • To determine the prevalence of dengue viruses and identify other potential arboviruses in the Seychelles population.

    Main Methods:

    • Sera were collected from outpatients in Mahé, Seychelles, between February and April 1979.
    • Neutralization tests were performed on collected sera to detect antibodies against dengue viruses, chikungunya virus, and Sindbis virus.

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    Main Results:

    • Prevalence rates for the four dengue virus serotypes ranged from 81% to 91.8%, with Dengue 2 identified as the most probable cause of the epidemics.
    • Antibodies to chikungunya virus (8.7%) and Sindbis virus (7.4%) were detected.
    • This study provides the first evidence of chikungunya and Sindbis virus circulation in the Seychelles.

    Conclusions:

    • Dengue virus serotype 2 was the primary etiological agent of the recorded dengue-like illness epidemics in the Seychelles.
    • The presence of chikungunya and Sindbis viruses in the Seychelles was confirmed for the first time, highlighting the region's arboviral diversity.