Abstract
La Réunion Island has been the scene of unusually large epidemics of dengue and chikungunya viruses with Aedes albopictus as the sole vector. After experimental oral infection, Ae. albopictus from La Réunion Island can disseminate both dengue and chikungunya viruses but not the Asian genotype of Zika virus, suggesting a strong midgut barrier to dissemination. Autochthonous transmission of the Asian genotype of Zika virus is improbable on La Réunion Island.
Highlights
La Réunion Island, a French overseas department in the Indian Ocean (21∘ 06′ S, 55∘ 36′ E) 800 km from Madagascar, has been the scene of unusually large epidemics of infections with arboviruses
The virus was probably introduced from the neighbouring Seychelles Island, where a DENV outbreak was ongoing from December 1976 to September 1977
After the DENV re-emergence in 2004, the first cases of chikungunya viruses (CHIKV) were recorded, which were the beginning of an epidemic of unprecedented size, affecting ∼38% of the population from March 2005 to June 2006
Summary
New mutated strain enabled better transmission by the atypical CHIKV vector Ae. albopictus (Vazeille et al, 2007). Between the DENV-1 and CHIKV outbreaks, co-infections were detected in patients and co-transmission of both viruses by local Ae. albopictus has been demonstrated experimentally (Vazeille et al, 2010).
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