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Background   Aedes aegypti  and  Aedes albopictus  are both vectors of chikungunya virus (CHIKV). The two  Aedes  species co-exist in the Indian Ocean region and were involved in the 2005-2006 CHIKV outbreaks. In the Reunion Island, a single mutation in the viral envelope has been selected that leads to high levels of replication in  Ae. albopictus , and a short extrinsic incubation period as the virus could be found in saliva as early as two days after infection. An important question is whether this variant is associated with adverse effects impacting some mosquito life-history traits such as survival and reproduction.    Results  We performed experimental infections using three mosquito strains of  Ae. aegypti  Mayotte and  Ae. albopictus  (Mayotte and Reunion), and two CHIKV strains (E1-226A and E1-226V).  Ae. aegypti  Mayotte were similarly susceptible to both viral strains, whereas  Ae. albopictus  Mayotte and  Ae. albopictus  Reunion were more susceptible to CHIKV E1-226V than to E1-226A. In terms of life-history traits measured by examining mosquito survival and reproduction, we found that: (1) differences were observed between responses of mosquito species to the two viruses, (2) CHIKV infection only affected significantly some life-history traits of  Ae. albopictus  Reunion and not of the other two mosquito strains, and (3) CHIKV reduced the lifespan of  Ae. albopictus  Reunion and shortened the time before egg laying.    Conclusion  We demonstrated that CHIKV only reduces the survival of  Ae. albopictus  from the Reunion Island. By laying eggs just before death, reproduction of  Ae. albopictus  from the Reunion Island is not reduced since other parameters characterizing oviposition and hatching were not affected.

Differential responses of the mosquito Aedes albopictus from the Indian Ocean region to two chikungunya isolates