Efficacy of Bacillus thuringiensis var. israelensis against malaria mosquitoes in northwestern Burkina Faso

Dambach, Peter; Louis, Valérie R.; Kaiser, Achim; Ouedraogo, Saïdou; Sié, Ali; Sauerborn, Rainer; Becker, Norbert

doi:10.1186/1756-3305-7-371

Cited by 52 publications

(45 citation statements)

References 15 publications

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“…Firstly, the short residual effect of Bti under tropical climatic conditions calls for frequent retreatment of breeding sites, roughly every 8 to 10 days 27,28 . Reducing the frequency of treatment intervals would significantly reduce the cost for manpower, transportation, and depending on the used product, the cost of larvicides.…”

Section: Improving Cost Effectiveness -Implications Of the Emira Projectmentioning

confidence: 99%

New approaches for integrated and cost-effective malaria vector control

Dambach¹

2018

J Rare Dis Res Treat

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Section: Improving Cost Effectiveness -Implications Of the Emira Projectmentioning

confidence: 99%

New approaches for integrated and cost-effective malaria vector control

Dambach¹

2018

J Rare Dis Res Treat

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“…Bacillus thuringiensis var. israelensis and Bacillus sphaericus based microbial larvicide products have lately been assessed and found to be effective in reducing malaria vector mosquito larvae under field conditions, and subsequent reduction in malaria vector population densities [32, 37–40]. Efficacy trials have also illustrated that Bti can reduce malaria transmission when implemented at a large scale [14], and when delivered as a supplementary measure alongside LLINs [5].…”

Section: Discussionmentioning

confidence: 99%

“…VectoBac ® WG product has previously demonstrated to have a high effectiveness within the first 24–48 h on low doses [32]. In this study, larval sampling was repeatedly conducted at the same sampling points, and 14 days after treatment and just before the next treatment.…”

Section: Methodsmentioning

confidence: 99%

Field effectiveness of microbial larvicides on mosquito larvae in malaria areas of Botswana and Zimbabwe

Mpofu

Becker

Mudambo

et al. 2016

Malar J

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BackgroundThe successful control of malaria vectors requires the control of both the larval and adult stages. The adult control methods through indoor residual spraying (IRS) and use of long-lasting insecticidal nets (LLINs) continue to be widely used with some high measure of success. Larval control methods are also being used by a number of National Malaria Control Programmes (NMCPs) with limited understanding of its contribution. Larval control might be needed in some areas to move from malaria control to elimination. This experimental study was conducted to assess the field effectiveness of winter larviciding on the larval stages of the mosquito in Botswana and Zimbabwe.MethodsTwo villages were selected in each of the two countries, one as an intervention and the other as the control. Water bodies in the intervention villages were treated using the commercial product VectoBac® WG (Valent BioSciences Corporation, IL, USA) containing the active ingredient Bacillus thuringiensis var. israelensis (Bti), a WHO recommended bio-larvicide, applied at a rate of 300 g per hectare. Random-effects Poisson regression was employed during data analysis to compare intervention with control sites with respect to larval counts.ResultsThe average marginal effect of larviciding on the mosquito larvae taking interaction with time (period) into account, was −1.94 (95% CI −2.42 to −1.46) with incidence rate ratio of 0.14, thus an 86% larval reduction attributable to the intervention for both countries combined. There was a 92% and 65% effect for Botswana and Zimbabwe respectively. The effect on the early larval and late stages was 77% (P < 0.001) and 91% (P < 0.001), respectively. Overall, intervention larval sampling points had five more larvae than the control at baseline and 26 less after 16 weeks. The effect on the different species also showed similar trends.Discussion/conclusionLarval control using Bti showed a high effect on the population of the mosquito larvae. The reduction of the early and late larval stages can lead to reduced adult mosquito emergence and low adult mosquito densities. Larviciding can be used to control mosquito vector population by suppressing the larval stages thereby reducing adult emergence and malaria risk.

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“…Perlu dilakukan penelitian lebih lanjut untuk mengetahui faktor lain yang mempengaruhi efektivitas B. thuringiensis H-14 di lapangan antara lain : ketinggian air, polusi, tingkat kekeruhan, kandungan bahan organik maupun non organik. Sediaan serbuk B. thuringensis H-14 isolat Salatiga yang dihasilkan memiliki konsentrasi yang lebih besar untuk mematikan jentik Anopheles jika dibandingkan dengan produk luar yang efektif membunuh jentik Anopheles pada konsentrasi 0,2 kg/ha (Dambach et al, 2014).…”

Section: Pendahuluanunclassified

PENGARUH KONDISI LINGKUNGAN TERHADAP EFEKTIVITAS Bacillus thuringiensis H-14 ISOLAT SALATIGA SEDIAAN SERBUK UNTUK PENGENDALIAN JENTIK Anopheles spp DI KABUPATEN KULON PROGO

Wardani

Nugroho²,

Anggraeni³

et al. 2019

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Malaria masih menjadi masalah kesehatan masyarakat di negara yang beriklim tropis seperti Indonesia. Pencegahan dan pengendalian vektor malaria salah satunya dengan menggunakan larvasida hayati yaitu Bacillus thuringiensis H-14 isolat Salatiga. B2P2VRP Salatiga membuat sediaan B. thuringiensis H-14 dalam bentuk serbuk untuk pengendalian jentik Anopheles spp. Penelitian bertujuan untuk mengetahui pengaruh kondisi lingkungan terhadap efektivitas serbuk B. thuringiensis H-14 isolat Salatiga. Penelitian dilakukan dengan membuat B. thuringiensis H-14 isolat Salatiga sediaan bubuk kemudian diuji di laboratorium untuk menentukan nilai LC95. B. thuringiensis H-14 Isolat Salatiga dilakukan pengujian lapangan di Kabupaten Kulon Progo dan ditentukan efektivitasnya. Pengukuran kondisi lingkungan di lapangan meliputi pH air, suhu air, intensitas cahaya, suhu udara, kelembaban udara. Kematian jentik dianalisis menggunakan probit, penurunan kematian menggunakan rumus Mulla, dan analisis faktor lingkungan menggunakan regresi linier. Hasil penelitian didapat nilai LC95 laboratorium sebesar 58,44 mg/m2. Pengamatan di lapangan menunjukkan bahwa rata-rata nilai Inhibiton Emergence (IE) terjadi penurunan efektivitas dari pengamatan hari pertama sebesar 92,94%, hari kedua sebesar 80,95%, dan hari ketiga sebesar 52,75%. Hasil uji statistik menunjukkan kondisi lingkungan yaitu pH air, suhu air, intensitas cahaya, suhu udara, kelembaban udara pada waktu pengujian tidak berpengaruh secara signifikan pada efektivitas serbuk B. thuringiensis H-14 isolat Salatiga dalam pengendalian jentik Anopheles spp.

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Efficacy of Bacillus thuringiensis var. israelensis against malaria mosquitoes in northwestern Burkina Faso

Cited by 52 publications

References 15 publications

New approaches for integrated and cost-effective malaria vector control

New approaches for integrated and cost-effective malaria vector control

Field effectiveness of microbial larvicides on mosquito larvae in malaria areas of Botswana and Zimbabwe

PENGARUH KONDISI LINGKUNGAN TERHADAP EFEKTIVITAS Bacillus thuringiensis H-14 ISOLAT SALATIGA SEDIAAN SERBUK UNTUK PENGENDALIAN JENTIK Anopheles spp DI KABUPATEN KULON PROGO

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