Differential responses of the mosquito Aedes albopictus from the Indian Ocean region to two chikungunya isolates
Autor(es): Martin Estelle, Moutailler Sara, Madec Yoann, Failloux Anna-Bella
Resumo: Aedes aegypti - Aedes albopictus are both vectors of chikungunya virus (CHIKV). The two Aedes species co-exist in the Indian Ocean region - were involved in the 2005-2006 CHIKV outbreaks. In the Reunion Isl-, a single mutation in the viral envelope has been selected that leads to high levels of replication in Ae. albopictus, - 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 - reproduction. We performed experimental infections using three mosquito strains of Ae. aegypti Mayotte - Ae. albopictus (Mayotte - Reunion), - two CHIKV strains (E1-226A - E1-226V). Ae. aegypti Mayotte were similarly susceptible to both viral strains, whereas Ae. albopictus Mayotte - 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 - 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 - not of the other two mosquito strains, - (3) CHIKV reduced the lifespan of Ae. albopictus Reunion - shortened the time before egg laying. We demonstrated that CHIKV only reduces the survival of Ae. albopictus from the Reunion Isl-. By laying eggs just before death, reproduction of Ae. albopictus from the Reunion Isl- is not reduced since other parameters characterizing oviposition - hatching were not affected.
Imprenta: BMC Ecology, v. 10, n. 8, 2010
Identificador do objeto digital: 10.1186/1472-6785-10-8
Descritores: Chikungunya virus - Pathogenesis ; Chikungunya virus - RNA ; Chikungunya virus - Viral infections ; Chikungunya Virus - Virus ; Chikungunya virus - Transmission ; Chikungunya virus - Public health
Data de publicação: 2010
