Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system

Regis, Lêda; Monteiro, Antônio Miguel Vieira; Melo-Santos, Maria Alice Varjal de; Silveira, José Constantino; Furtado, André Freire; Acioli, Ridelane Veiga; Santos, Gleice Maria; Nakazawa, Mineo; Carvalho, Marília Sá; Ribeiro, Paulo Justiniano; Souza, Wayner Vieira de

doi:10.1590/s0074-02762008000100008

Cited by 128 publications

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“…TP is the proportion of positive traps; MED is the ratio between the total number of eggs collected and the total number of traps (Regis et al 2008). Differences in TP and MED between seasons per neighbourhood were analysed (χ 2 and Wilcoxon tests respectively calculated using the software R 2.6.0, (R Development Core Team 2006).…”

Section: Methodsmentioning

confidence: 99%

Seasonal dynamics of Aedes aegypti (Diptera: Culicidae) in the northernmost state of Brazil: a likely port-of-entry for dengue virus 4

Codeço¹,

Honório

Ríos-Velásquez

et al. 2009

Mem. Inst. Oswaldo Cruz

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The highest infestation rates occurred during the peak of the rainy seasons, but a large presence was also observed during the early dry season (although with more variation among years). Spatial distribution of positive houses changed from a sparse and local pattern to a very dense pattern during the dry-wet season transition. These results suggest that the risk of dengue transmission and the potential for the new serotype invasions are high for most of the year.Key words: Aedes aegypti -dengue fever -ovitraps -seasonality -Amazon Separated from the rest of country by the Amazonian Forest, Roraima (RR) is the most isolated state in Brazil. Boa Vista, its capital, is a medium-sized city (249,853 inhabitants) (IBGE 2008a) located in the middle of a sparsely populated savannah. A highway is the only paved interstate route, connecting Boa Vista to the city of Manaus 805 km to the south and the Venezuelan border 220 km to the north. Despite its isolation, Boa Vista (and RR as a whole) has received -and continues to receive -a large inflow of visitors and migrants from Venezuela, Guyana and the Caribbean countries, as well as migrants from other regions of Brazil. As a consequence, RR's population increased from 79,400 inhabitants in 1980 to 395,725 inhabitants in 2008, a 5-fold increase in fewer than 30 years. Today, 53.7% of RR's population are immigrants, the highest proportion observed in Brazil (IBGEb 2008).The first dengue fever epidemic in Brazil after the re-invasion by Aedes aegypti occurred in Boa Vista in 1981-1982 with 11,000 reported cases (Osanai et al. 1983, Travassos-da-Rosa et al. 1998. DENV-1 and DENV-4 were isolated. For four years prior to this, DENV-1 was spreading throughout the Caribbean Islands, Central America and Northern South America (Moros et al. 2003, Uzcategui et al. 2003. The year 1981 also marked the arrival of DENV-4 in the Americas (Lanciotti et al. 1997). In Boa Vista, this first invasion was interrupted through vector control programs and the country was spared any new dengue invasions until 1986, when DENV-1 arrived in Rio de Janeiro, triggering nationwide epidemics (Nogueira et al. 2007). Dengue fever has become an endemic disease in Brazil, with the cocirculation of DENV-1, DENV-2 and DENV-3 in most of the 27 Brazilian states. DENV-4 did not persist in Brazil after RR's 1981-1982 outbreak (Nogueira et al. 2007). For several years now, RR has consistently had one of the highest dengue incidence rates among Brazilian states. In 2007, RR registered an incidence rate of 594.8 cases per 10,000 inhabitants. This was the highest rate after Amapá (877.7), Tocantins (TO) (1415.3) and Mato Grosso do Sul (MS) (3213). In 2006, the incidence rate in RR was 657.8, highest after MS (688.3) and TO (665.7) (MS 2007).Ae. aegypti in Boa Vista, RR • Cláudia Torres Codeço et al. 615Its proximity to Venezuela, where all four dengue serotypes are found, and appropriate vector and climate conditions for dengue transmission, make Boa Vista a strategic point for dengue surveillance in Brazil. Despite th...

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Section: Methodsmentioning

confidence: 99%

Seasonal dynamics of Aedes aegypti (Diptera: Culicidae) in the northernmost state of Brazil: a likely port-of-entry for dengue virus 4

Codeço¹,

Honório

Ríos-Velásquez

et al. 2009

Mem. Inst. Oswaldo Cruz

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“…This method was proven effective in detecting early infestations of Aedes aegypti L., particularly when density is low and larval indices are not good indicators (Braga et al 2000, Morato et al 2005. It is also useful in indicating critical areas for control activities (Masuh et al 2008, Regis et al 2008.There is a consensus regarding the use of organic infusions to achieve a better ovitrap performance. Most studies have used infusions of hay (Reiter et al 1991, Chadee et al 1993, Maciel-de-Freitas et al 2008b, white-oak leaf (Ponnusamy et al 2008, Trexler et al 1998, mixed grass (Regis et al 2008) and Panicum maximum (Sant'ana et al 2006, Gama et al 2007.…”

mentioning

confidence: 99%

“…It is also useful in indicating critical areas for control activities (Masuh et al 2008, Regis et al 2008.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…Most studies have used infusions of hay (Reiter et al 1991, Chadee et al 1993, Maciel-de-Freitas et al 2008b, white-oak leaf (Ponnusamy et al 2008, Trexler et al 1998, mixed grass (Regis et al 2008) and Panicum maximum (Sant'ana et al 2006, Gama et al 2007. The association of grass infusion, Eleusine indica, with the biological larvicide Bacillus thuringiensis israelensis in the fi eld has also been used (Santos et al 2003), offering the advantage of a long-term duration of traps in the wild.…”

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Oviposition activity of Aedes aegypti L. (Diptera: Culicidae) in responseto different organic infusions

Santos¹,

Correia²,

Muniz³

et al. 2010

Neotrop. entomol.

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-The present study investigates new sources of infusion as an oviposition attractant for Aedes aegypti L. Infusions with fetid and non-fetid odors were compared as an oviposition stimulant. Traps baited with infusions of dehydrated cashew leaves (Anacardium occidentale), potato peels (Solanum tuberosum) and graminea (Panicum maximum) were compared as attractants, and the effect of odor (fetid and unfetid) on attractiveness was tested. Oviposition activity changed signifi cantly according to the concentration and type of infusion (F = 4.1279; gl = 2; P = 0.0231). A larger number of eggs were observed in cups containing 50% A. occidentale (non-fetid odor) and 30% P. maximum (fetid odor). When compared in the same cage, comparable oviposition was found between A. occidentale and P. maximum. Moreover, approximately 20% more eggs were recorded in the infusion without odor when compared to the grass infusion and water. These fi ndings suggest A. occidentale as a new stimulant for use in ovitraps for Aedes surveillance and control, with the benefi t of having an agreeable odor.KEY WORDS: Attractive, mosquito, posture, ovitrap Epidemiologically, gravid females are the most important component of the mosquito population and are targeted in mosquito reduction programs and in the active surveillance of disease for the early detection of epidemic events (Macielde-Freitas et al 2008a). Mosquito egg traps (ovitrap) are a current trend as integral components of surveillance efforts, contributing to control efforts and monitoring of mosquito populations in countries with endemic dengue fever. This method was proven effective in detecting early infestations of Aedes aegypti L., particularly when density is low and larval indices are not good indicators (Braga et al 2000, Morato et al 2005. It is also useful in indicating critical areas for control activities (Masuh et al 2008, Regis et al 2008.There is a consensus regarding the use of organic infusions to achieve a better ovitrap performance. Most studies have used infusions of hay (Reiter et al 1991, Chadee et al 1993, Maciel-de-Freitas et al 2008b, white-oak leaf (Ponnusamy et al 2008, Trexler et al 1998, mixed grass (Regis et al 2008) and Panicum maximum (Sant'ana et al 2006, Gama et al 2007. The association of grass infusion, Eleusine indica, with the biological larvicide Bacillus thuringiensis israelensis in the fi eld has also been used (Santos et al 2003), offering the advantage of a long-term duration of traps in the wild. Recent efforts have been made to identify potential synthetic oviposition attractants/repellents for mosquitoes using certain fatty acids and esters from grass infusions (Sant'ana et al 2006) and egg extracts of A. aegypti as oviposition attractants (Ganesan et al 2006). However, different types and concentrations of organic detritus lead to variations in the abundance and types of microorganisms (Yee & Juliano 2006, Murrel & Juliano 2008, which could, in turn, infl uence the potential attraction of the infusion. Thus, the most appropriate org...

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A Fuzzy Cellular Automata for SIR Compartmental Models

Costa

Medeiros

Sandri

2013

Fuzzy Logic and Applications

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Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system

Abstract: A new approach to dengue vector surveillance based on permanent egg-collection using a modified ovitrap and

Cited by 128 publications

References 25 publications

Seasonal dynamics of Aedes aegypti (Diptera: Culicidae) in the northernmost state of Brazil: a likely port-of-entry for dengue virus 4

Seasonal dynamics of Aedes aegypti (Diptera: Culicidae) in the northernmost state of Brazil: a likely port-of-entry for dengue virus 4

Oviposition activity of Aedes aegypti L. (Diptera: Culicidae) in responseto different organic infusions

A Fuzzy Cellular Automata for SIR Compartmental Models

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