Comparação entre pesquisa larvária e armadilha de oviposição, para detecção de Aedes aegypti

Abstract

Resumo O estudo compara duas técnicas para a detecção da presença de Aedes aegypti: pesquisa de larva e armadilha de oviposição. Em duas áreas do município de Salvador, Bahia, foram investigadas 5.026 domicílios. As duas técnicas empregadas foram usadas simultaneamente nos mesmos domicílios. Diferentes níveis de positividade (larva e ou ovo) foram detectados entre e dentro das duas áreas. Contudo, apenas a armadilha de oviposição detectou uma diferença estatística significante entre as duas áreas (z = 9,520 p < 0,001). A comparação entre os Índices de Breteau, Índice Predial e Índice de Oviposição revelou o último método como o mais sensível poder de detecção da positividade para A. aegypti. A prevalência da razão de positividade para a armadilha de oviposição foi de 3,4 e 2,1 (para áreas 1 e 2 respectivamente), quando comparada com a pesquisa de larva. A armadilha de oviposição provou ser um método econômico e operacionalmente viável, sendo muito efetivo na vigilância de A. aegypti. Palavras-chaves: Pesquisa de larva. Armadilha de oviposição. Vigilância de Aedes aegypti.Abstract This study compares two techniques for detecting the presence of Aedes aegypti: larval surveys and the oviposition trap. In two areas of the municipality of Salvador, Bahia, Brazil were investigated 5,026 households. Larval surveys and oviposition traps were used simultaneously in these households. Different positivity levels (larvae and/or eggs) were detected between and within the two areas. However, only the use of the oviposition trap detected a significant statistical difference between the areas (z = 9,520, p < 0.001). Comparison of the Breteau, Household and Oviposition Indices reveals greater power of detection of positivity in the oviposition trap. There were prevalence ratios of positivity for ovipositision trap of 3.4 and 2.1 (for areas 1 and 2 respectively) when compared with larval surveys. The oviposition trap proved to be an economical and operationally viable method, and the most effective in the surveillance of this species.

Identification of the best ovitrap installation sites for gravid Aedes (Stegomyia) aegypti in residences in Mirassol, state of São Paulo, Brazil

“…Thus, this method was confirmed to be efficient in detecting vectors of Aedes (Stg. ), as has been described by Fay and Eliason (1966), Marques et al (1993), andBraga et al (2000).…”

“…aegypti, demonstrated that the trap was more sensitive for the detection of this insect, as well as being a cheaper method and operationally viable, with its utilization being preferred for vectorial surveillance (Braga et al 2000). Rawlins et al (1998) compared the larval monitoring method with the presence of eggs in ovitraps in Trinidad and confirmed that the traps were significantly more sensitive.…”

Olfaction in vector-host interactions

“…However, many comparative studies between the larval survey and ovitrap use have shown that the ovitrap, besides being more sensitive in the detection of Ae. aegypti, also has a lower cost but demonstrates limited operational viability in entomological surveillance (Braga et al 2000, Rawlins et al 1998. When ovitraps are used in urban areas where several species of the Stegomyia subgenus occur sympatrically, the eggs are morphologically indistinguishable and, thus there is a need for identification of larvae.…”

Preliminary evaluation of the "Dengue-MI" technology for Aedes aegyptimonitoring and control

“…Ovitraps baited with grass infusions are more sensitive than larval surveys 4,5,7,8 , but their use is indicated more for periods of low vector population density. The method also requires laboratory personnel and only allows quantifying the number of eggs deposited, thus hindering estimation of the vector population density in a given area 4 .…”