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© Christine Schmitt, Anubis Vega Rua, Jean-Marc Panaud
Tête de moustique femelle Aedes albopictus, vecteur du virus de la dengue et du chikungunya. Microphotographie électronique à balayage, image colorisée.
Publication : Tropical medicine & international health : TM & IH

High susceptibility to Chikungunya virus of Aedes aegypti from the French West Indies and French Guiana

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Tropical medicine & international health : TM & IH - 17 Aug 2010

Girod R, Gaborit P, Marrama L, Etienne M, Ramdini C, Rakotoarivony I, Dollin C, Carinci R, Issaly J, Dusfour I, Gustave J, Yp-Tcha MM, Yébakima A, Failloux AB, Vazeille M

Link to Pubmed [PMID] – 21371212

Trop. Med. Int. Health 2011 Jan;16(1):134-9

OBJECTIVES: To estimate the vector competence of Aedes aegypti populations sampled from distinct anthropogenic environments in French Guiana, Guadeloupe and Martinique for the strain CHIKV 06.21.

METHODS: F(1)/F(2) females were orally infected at titres of 10(6) and 10(7.5) pfu/ml in blood-meals. Disseminated infection rates (DIR) of mosquitoes were estimated using indirect fluorescent antibody assay on heads’ squashes, 7 or 14 days post-infection (pi).

RESULTS: At a titre of 10(7.5) pfu/ml, DIR ranged from 88.9% to 100.0% and were not significantly different whether assessed at day 7 or 14 pi. At a titre of 10(6) pfu/ml, DIR observed 7 days pi ranged from 37.6 to 62.0%.

CONCLUSIONS: Ae. aegypti from French Guiana and French West Indies are highly competent to transmit CHIKV. An evaluation of DIR 7 days rather than 14 days pi is adequate to estimate vector competence. The titre of 10(6) pfu/ml allows us to distinguish Ae. aegypti populations originating from distinct environments (dense or diffuse housing) by their vector competence. This assessment is a prerequisite to better evaluate the potential risk of Chikungunya outbreaks once the virus is introduced from endemic regions.

http://www.ncbi.nlm.nih.gov/pubmed/21371212