Field trial on a novel control method for the dengue vector, Aedes aegypti by the systematic use of Olyset® Net and pyriproxyfen in Southern Vietnam

Tsunoda, Takahiro; Kawada, Hiroyuki; Huynh, Trang; Luu, Loan; Le, San Hoang; Tran, Hau Phuc; Vu, Huong; Le, Hieu Minh; Hasebe, Futoshi; Tsuzuki, Ataru; Takagi, Masahiro

doi:10.1186/1756-3305-6-6

Cited by 35 publications

(48 citation statements)

References 36 publications

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“…Tackling the problem of human movement in dengue studies is more difficult because Aedes aegypti feeds during the day when people are engaged in their daily activities. Potential strategies to avoid this would be to use larger cluster areas or monitor epidemiological outcomes in a sentinel cohort that is less mobile (e.g., young children) [64]. Even if these steps are taken it is a good idea to collect travel histories from study participants, particularly if the intervention is located in a household.…”

Section: Selection Of Sites For Entomological Monitoringmentioning

confidence: 99%

Evidence-based vector control? Improving the quality of vector control trials

Wilson

Boelaert

Kleinschmidt

et al. 2015

Trends in Parasitology

124

151

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Vector-borne diseases (VBDs) such as malaria, dengue, and leishmaniasis cause a high level of morbidity and mortality. Although vector control tools can play a major role in controlling and eliminating these diseases, in many cases the evidence base for assessing the efficacy of vector control interventions is limited or not available. Studies assessing the efficacy of vector control interventions are often poorly conducted, which limits the return on investment of research funding. Here we outline the principal design features of Phase III vector control field studies, highlight major failings and strengths of published studies, and provide guidance on improving the design and conduct of vector control studies. We hope that this critical assessment will increase the impetus for more carefully considered and rigorous design of vector control studies.Evidence-based policy making on vector control VBDs such as malaria, dengue, and leishmaniasis are responsible for considerable morbidity and mortality and fall disproportionately on the poorest communities in the developing world [1-4]. One of the key methods by which VBDs can be controlled and eliminated is through vector control [5-10]; for example, long-lasting insecticidal nets (LLINs) for malaria or indoor residual spraying (IRS) for Chagas disease.Development of vector control interventions follows a multistage process [11] (Figure 1). First, a draft target product profile should be generated. This document guides the development process by outlining the features and performance targets of the intended vector control tool. The next step is demonstrating the proof of concept by conducting Phase I studies (laboratory assays to determine the mode of action) and Phase II (semi-field and small-scale field) studies, which generally have entomological end points. Large-scale Phase III field studies (efficacy studies) (see Glossary) are then conducted, which measure the efficacy of the vector control tool against epidemiological outcomes when implemented under optimal conditions. Based on the results of Phase III trials, the World Health Organization (WHO) will make recommendations for pilot implementation. These Phase IV studies will assess the effectiveness of the vector control tool when it is delivered and used operationally (i.e., under 'real-world' conditions), as well as collecting information on feasibility, distribution mechanisms, acceptability, economics, and safety. Information gathered from the Phase III and IV studies will enable the WHO to draw up policy recommendations and, in parallel, member states will develop country-level policy.Evidence-based policy making on vector control tools is now regarded as essential and is adopted by the WHO [12,13] (Box 1). The quality of evidence on vector control interventions from epidemiological trials or systematic reviews needs to be rated before recommendations and policy can be formulated. Since 2008, the WHO has adopted the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) methodology fo...

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Section: Selection Of Sites For Entomological Monitoringmentioning

confidence: 99%

Evidence-based vector control? Improving the quality of vector control trials

Wilson

Boelaert

Kleinschmidt

et al. 2015

Trends in Parasitology

124

151

View full text Add to dashboard Cite

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“…Recently, as an example of insecticide-impregnated net-based technology, Kawada et al (2012) set the permethrin-impregnated net on the ceiling as a more effective methodology against malaria. Tsunoda et al (2013) reported a novel control method of using permethrin-impregnated nets as the lids over jars to control Aedes aegypti (L.). The combination of these methods proved to be effective for the control of malaria and dengue vector mosquitoes.…”

Section: Discussionmentioning

confidence: 99%

Insecticide-impregnated net originally invented to control malaria vectors can be used to control other arthropod pests

Ogino

Hara

Araki³

et al. 2019

Jap. J. Sanit. Zool.

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We evaluated an insecticide-impregnated net, originally invented for malaria vector control, as a tool to control vectors and stored product insects in a laboratory trial. First, we performed the standard continuous contact test on German cockroach, American cockroach, house fly, cigarette beetle, rice weevil, and red flour beetle; lethal effects were found on all of these insects, except red flour beetle. The house fly and cigarette beetle were affected very rapidly in the contact tests. Second, we disclosed that seating the net proved to act as a barrier against American cockroach. From the third day of the experiment, the roaches did not enter the shelter in the treated zone, and the quantity of feces left on the control shelters was greater than that on the treated shelters. Thus, the net was shown to repel the roaches from the treated shelters. Third, suspending a strip of the net in a cage had knockdown and lethal effect on house flies and flesh flies. This study has shown the applicability and the utility of an insecticide-impregnated net to control pests other than malaria vectors.

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“…Considering the increasing use of lethal ovitraps for Aedes control (Zeichner 2011), the success of nets impregnated with insecticides in controlling malaria (Rachavendra et al 2011), more recently evaluated in dengue control (Kroeger et al 2006;Lenhart et al 2008), and the use of controlled release formulations for mosquito larvae control (Nayar et al 2002;Seng et al 2006, Tsunoda et al 2013, our laboratory began to evaluate different natural materials such as stearin, paraffin and beeswax containing different amounts of pyriproxyfen as slow release formulations for A. aegypti control. In a previous work, hollow candles made of a paraffin/stearin mixture or beeswax containing 0.01 or 0.05 % pyriproxyfen and used as bioassay jars showed EI 100 % and residual activity of at least 1 year (Juan et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Aedes aegypti (Diptera: Culicidae): evaluation of natural long-lasting materials containing pyriproxyfen to improve control strategies

et al. 2014

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Natural materials such as beeswax or a paraffin/ stearin mixture containing pyriproxyfen and used as a slow release formulation may convert any breeding place into a larvicidal ovitrap for Aedes aegypti (L.) control. Effectiveness and residual activity of beeswax and paraffin/stearin 1:1 discs containing from 10 −5 to 10 −1 % pyriproxyfen and sticked at the bottom of plastic jars were evaluated for adult emergence inhibition (EI) on late 3rd or early 4th instar A. aegypti larvae. At the initial time t=0, the EI was 100 % for vessels containing beeswax or paraffin/stearin 1:1 discs containing up to 10 −4 % pyriproxyfen. For the lowest pyriproxyfen concentration of 10 −5 %, paraffin/stearin mixture gave a higher EI% value than beeswax (100 and 50 %, respectively). Jars were kept at room temperature, and water was totally replaced every 15 days. Bioassays for residual activity repeated monthly showed that at 30 days and for pyriproxyfen 10 −5 % and both matrices, the EI values were low and comparable to control values. For pyriproxyfen 10 −4 %, EI remained above 95 % for at least 90 days and around 75 % up to 180 days. The EI values are always higher for paraffin/stearin mixture than for beeswax. For all other higher concentrations, 100 % EI was obtained at least during 300 days. In a semi-field trial, paraffin/stearin/sand O-rings (2:1:2), containing pyriproxyfen 1 %, were sunken in 200-l water-storage tanks and held outdoors in a shadow place. After 72 h, a 250-ml aliquot was taken (t = 0) obtaining 100 % EI. Water level was completed to 200 l every 15 days and bioassays repeated monthly as before. Residual activity remains with 100 % EI at least for 6 months.

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Field trial on a novel control method for the dengue vector, Aedes aegypti by the systematic use of Olyset® Net and pyriproxyfen in Southern Vietnam

Cited by 35 publications

References 36 publications

Evidence-based vector control? Improving the quality of vector control trials

Evidence-based vector control? Improving the quality of vector control trials

Insecticide-impregnated net originally invented to control malaria vectors can be used to control other arthropod pests

Aedes aegypti (Diptera: Culicidae): evaluation of natural long-lasting materials containing pyriproxyfen to improve control strategies

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