Temporal abundance of Aedes aegypti in Manaus, Brazil, measured by two trap types for adult mosquitoes

Abstract

A longitudinal study was conducted in Manaus, Brazil, to monitor changes of adult Aedes aegypti (L.) abundance. The objectives were to compare mosquito collections of two trap types, to characterise temporal changes of the mosquito population, to investigate the influence of meteorological variables on mosquito collections and to analyse the association between mosquito collections and dengue incidence. Mosquito monitoring was performed fortnightly using MosquiTRAPs (MQT) and BG-Sentinel (BGS) traps between December 2008-June 2010. The two traps revealed opposing temporal infestation patterns, with highest mosquito collections of MQTs during the dry season and highest collections of BGS during the rainy seasons. Several meteorological variables were significant predictors of mosquito collections in the BGS. The best predictor was the relative humidity, lagged two weeks (in a positive relationship). For MQT, only the number of rainy days in the previous week was significant (in a negative relationship). The correlation between monthly dengue incidence and mosquito abundance in BGS and MQT was moderately positive and negative, respectively. Catches of BGS traps reflected better the dynamic of dengue incidence. The findings help to understand the effects of meteorological variables on mosquito infestation indices of two different traps for adult dengue vectors in Manaus.

Relationship between local presence and density of Aedes aegypti eggs with dengue cases: a spatial analysis approach

“…Degener et al . , using MosquiTRAPs (Ecovec Ltda, Brazil) and BG‐Sentinel (BGS) traps, evaluated the relationship between mosquito abundance and dengue incidence in Manaus, Amazonas. The authors found contradictory results, because there was positive correlation for BGS traps and negative correlation for MosquiTRAPs.…”

“…The relationship between mosquito abundance and the occurrence of dengue continues to be studied using several tools to measure the number of vectors in a region, probably due to the limitations of the techniques used. Degener et al [11], using MosquiTRAPs (Ecovec Ltda, Brazil) and BG-Sentinel (BGS) traps, evaluated the relationship between mosquito abundance and dengue incidence in Manaus, Amazonas. The authors found contradictory results, because there was positive correlation for BGS traps and negative correlation for Mosqui-TRAPs.…”

Arbovirus Vectors of Epidemiological Concern in the Americas: A Scoping Review of Entomological Studies on Zika, Dengue and Chikungunya Virus Vectors

“…albopictus early in the wet season, and that interspecific mosquito crowding was highest one kilometer from the coast [17]. Degener et al [18], Lucio et al [19], Da Cruz Ferreira et al [20] and Regis et al [21] studied the impact of meteorological variables on Ae. aegypti infestation levels in South America.…”

“…aegypti infestation levels in South America. Degener et al [18] found relative humidity to be the best predictor Ae. aegypti abundance, Lucio et al [19] found saturated vapor pressure deficit to be most pertinent, and Da Cruz Ferreira [20] found mean temperatures above 18 °C and humidity levels below 75% to be positively predictive of Ae.…”

“…aegypti abundance. As a secondary outcome, Degener et al [18] found that MosquiTRAPs, which lure gravid Ae. aegypti through visual and olfactory stimuli, collected more Ae.…”