Species composition, seasonal occurrence, habitat preference and altitudinal distribution of malaria and other disease vectors in eastern Nepal
Autor(es): Dhimal Meghnath, Ahrens Bodo, Kuch Ulrich
Resumo: It is increasingly recognized that climate change can alter the geographical distribution of vector-borne diseases (VBDs) with shifts of disease vectors to higher altitudes - latitudes. In particular, an increasing risk of malaria - dengue fever epidemics in tropical highl-s - temperate regions has been predicted in different climate change scenarios. The aim of this paper is to exp- the current knowledge on the seasonal occurrence - altitudinal distribution of malaria - other disease vectors in eastern Nepal. Adult mosquitoes resting indoors - outdoors were collected using CDC light trap - aspirators with the support of flash light. Mosquito larvae were collected using locally constructed dippers. We assessed the local residents' perceptions of the distribution - occurrence of mosquitoes using key informant interview techniques. Generalized linear models were fitted to assess the effect of season, resting site - topography on the abundance of malaria vectors. The known malaria vectors in Nepal, Anopheles fluviatilis, Anopheles annularis - Anopheles maculatus complex members were recorded from 70 to 1,820 m above sea level (asl). The vectors of chikungunya - dengue virus, Aedes aegypti - Aedes albopictus, the vector of lymphatic filariasis, Culex quinquefasciatus, - that of Japanese encephalitis, Culex tritaeniorhynchus, were found from 70 to 2,000 m asl in eastern Nepal. Larvae of Anopheles, Culex - Aedes species were recorded up to 2,310 m asl. Only season had a significant effect on the abundance of An. fluviatilis, season - resting site on the abundance of An. maculatus complex members, - season, resting site - topography on the abundance of An. annularis. The perceptions of people on mosquito occurrence are consistent with entomological findings. This study provides the first vertical distribution records of vector mosquitoes in eastern Nepal - suggests that the vectors of malaria - other diseases have already established populations in the highl-s due to climatic - other environmental changes. As VBD control programmes have not been focused on the highl-s of Nepal, these findings call for actions to start monitoring, surveillance - research on VBDs in these previously disease-free, densely populated - economically important regions.
Palavras-Chave: Aedes; Anopheles; Culex; Climate change; Dengue; Elimination; Japanese encephalitis; Lymphatic filariasis; Mosquito-borne diseases
Imprenta: Parasites & Vectors, v. 7, p. 540, 2014
Identificador do objeto digital: 10.1186/s13071-014-0540-4
Descritores: Chikungunya virus - Pathogenesis ; Chikungunya virus - Viral infections ; Chikungunya Virus - Virus ; Chikungunya virus - Transmission ; Chikungunya virus - Chikungunya fever ; Chikungunya virus - Dengue ; Chikungunya virus - Epidemic ; Chikungunya virus - Epidemiology ; Chikungunya virus - Public health
Data de publicação: 2014
