Journal
MEMORIAS DO INSTITUTO OSWALDO CRUZ
Volume 104, Issue 4, Pages 632-635Publisher
FUNDACO OSWALDO CRUZ
DOI: 10.1590/S0074-02762009000400017
Keywords
vertical transmission; chikungunya virus; Aedes albopictus; La Reunion Island; Indian Ocean
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Funding
- Institut Pasteur [PTR 201]
- Agence Nationale pour la Recherche
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Aedes albopictus was responsible for transmission in the first outbreak of chikungunya (CHIK) on La Reunion Island, Indian Ocean, in 2005-2006. The magnitude of the outbreak on this island, which had been free of arboviral diseases for over 30 years, as well as the efficiency of Ae. albopictus as the main vector, raises questions about the maintenance of the CHIK virus (CHIKV) through vertical transmission mechanisms. Few specimens collected from the field as larvae were found to be infected. In this study, Ae. albopictus originating from La Reunion were orally infected with a blood-meal containing 10(8) pfu/mL of the CHIKV epidemic strain (CHIKV 06.21). Eggs from the first and second gonotrophic cycles were collected and raised to the adult stage. The infectious status of the progeny was checked (i) by immunofluorescence on head squashes of individual mosquitoes to detect the presence of viral particles or (ii) by quantitative RT-PCR on mosquito pools to detect viral RNA. We analysed a total of 1,675 specimens from the first gonotrophic cycle and 1,709 from the second gonotrophic cycle without detecting any viral particles or viral RNA. These laboratory results are compared to field records.
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