Population genetic structure and competence as a vector for dengue type 2 virus of Aedes aegypti and Aedes albopictus from Madagascar.

Abstract

Abstract. Starch gel electrophoresis was used to assess the polymorphism of 7 isoenzymes in single mosquitoes (field-collected F0 or F1 generation) for Aedes albopictus (8 strains) from northern Madagascar. Mosquitoes of the F2 generation (3 strains of Aedes aegypti and 10 strains of Ae. albopictus) were tested for oral susceptibility to dengue type 2 virus. Aedes aegypti was less susceptible to viral infection than Ae. albopictus. The genetic differentiation was less high between Ae. albopictus populations collected in agglomerations connected by highly frequented roads, indicating that human ground transportation favors mosquito dispersal. These results have implications for the ecology, pattern of migration, and relative importance in epidemic transmission of dengue viruses between the 2 Aedes species.

Large Genetic Differentiation and Low Variation in Vector Competence for Dengue and Yellow Fever Viruses of Aedes Albopictus From Brazil, the United States, and the Cayman Islands

“…13 Human movement is known to facilitate mosquito dispersal (e.g., eggs, larvae, or adults) along commercial routes and consequently attenuate genetic divergence between geographically distant populations. 51 However, Ae. albopictus populations in Florida tended to become more differentiated as geographic distances separating them increased.…”

Outbreak of Dengue and Chikungunya Fevers, Toamasina, Madagascar, 2006

“…This species had already been reported in the eastern coast of Madagascar (5). Individual mosquitoes from this species, sampled in Antananarivo (in the highlands of Madagascar) in the 1970s and more recently in northern Madagascar, are highly susceptible to CHIKV and DENV (6)(7)(8). This situation, associated with a high larvae index and probably a nonimmune population, led to a high rate of transmission, as indicated by the high percentage of DENV-1 and CHIKV co-infection detected in the 55 patients tested (18%) and the high attack rate (67.5%).…”

Genetic Structure of Anopheles (Nyssorhynchus) marajoara (Diptera: Culicidae) in Colombia

“…marajoara studied, which has been reported for other mosquitoes (Ravel and others 74 for Ae. aegypti in México; Vazeille and others 75 for Ae. albopictus in Madagascar; García-Franco and others 76 for Ae.…”