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Herrera-Bojórquez J, Trujillo-Peña E, Vadillo-Sánchez J, Riestra-Morales M, Che-Mendoza A, Delfín-González H, Pavía-Ruz N, Arredondo-Jimenez J, Santamaría E, Flores-Suárez AE, Vazquez-Prokopec G, Manrique-Saide P. Efficacy of Long-lasting Insecticidal Nets With Declining Physical and Chemical Integrity on Aedes aegypti (Diptera: Culicidae). JOURNAL OF MEDICAL ENTOMOLOGY 2020; 57:503-510. [PMID: 31603517 DOI: 10.1093/jme/tjz176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Indexed: 06/10/2023]
Abstract
Fitting long-lasting insecticidal nets (LLIN) as screens on doors/windows has a significant impact on indoor-adult Aedes aegypti (L.), with entomological reductions measured in a previous study being significant for up to 2 yr post-installation, even in the presence of pyrethroid-resistant Aedes populations. To better understand the mode of LLIN protection, bioassays were performed to evaluate the effects of field deployment (0, 6, and 12 mo) and damage type (none, central, lateral, and multiple) on LLIN efficacy. Contact bioassays confirmed that LLIN residual activity (median knockdown time, in minutes, or MKDT) decreased significantly over time: 6.95 (95% confidence interval [CI]: 5.32-8.58) to 9.24 (95% CI: 8.69-9.79) MKDT at 0- and 12-mo age, respectively, using a pyrethroid-susceptible Aedes strain. Tunnel tests (exposing human forearm for 40 min as attractant) showed that deployment time affected negatively Aedes passage inhibition from 54.9% (95% CI: 43.5-66.2) at 0 mo to 35.7% (95% CI: 16.3-55.1) at 12 mo and blood-feeding inhibition from 65.2% (95% CI: 54.2-76.2) to 48.9% (95% CI: 26.4-71.3), respectively; both the passage/blood-feeding inhibition increased by a factor of 1.8-2.9 on LLINs with multiple and central damages compared with nets with lateral damage. Mosquito mortality was 74.6% (95% CI: 65.3-83.9) at 0 mo, 72.3% (95% CI: 64.1-80.5) at 6 mo, and 59% (95% CI: 46.7-71.3) at 12 mo. Despite the LLIN physical integrity could be compromised over time, we demonstrate that the remaining chemical effect after field conditions would still contribute to killing/repelling mosquitoes.
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Affiliation(s)
- Josué Herrera-Bojórquez
- Collaborative Unit for Entomological Bioassays, Campus de Ciencias Biologicas y Agropecuarias, Universidad Autonoma de Yucatan. Merida, Yucatan, Mexico
| | - Emilio Trujillo-Peña
- Collaborative Unit for Entomological Bioassays, Campus de Ciencias Biologicas y Agropecuarias, Universidad Autonoma de Yucatan. Merida, Yucatan, Mexico
| | - José Vadillo-Sánchez
- Collaborative Unit for Entomological Bioassays, Campus de Ciencias Biologicas y Agropecuarias, Universidad Autonoma de Yucatan. Merida, Yucatan, Mexico
| | - Martin Riestra-Morales
- Collaborative Unit for Entomological Bioassays, Campus de Ciencias Biologicas y Agropecuarias, Universidad Autonoma de Yucatan. Merida, Yucatan, Mexico
| | - Azael Che-Mendoza
- Collaborative Unit for Entomological Bioassays, Campus de Ciencias Biologicas y Agropecuarias, Universidad Autonoma de Yucatan. Merida, Yucatan, Mexico
| | - Hugo Delfín-González
- Collaborative Unit for Entomological Bioassays, Campus de Ciencias Biologicas y Agropecuarias, Universidad Autonoma de Yucatan. Merida, Yucatan, Mexico
| | - Norma Pavía-Ruz
- Centro de Investigaciones Regionales, Dr. Hideyo Noguchi, Universidad Autonoma de Yucatan. Merida, Yucatan, Mexico
| | - Juan Arredondo-Jimenez
- Universidad Autonoma de Nuevo Leon, Facultad de Ciencias Biologicas, San Nicolas de los Garza, N.L., Mexico
| | | | - Adriana E Flores-Suárez
- Universidad Autonoma de Nuevo Leon, Facultad de Ciencias Biologicas, San Nicolas de los Garza, N.L., Mexico
| | | | - Pablo Manrique-Saide
- Collaborative Unit for Entomological Bioassays, Campus de Ciencias Biologicas y Agropecuarias, Universidad Autonoma de Yucatan. Merida, Yucatan, Mexico
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Djènontin A, Moiroux N, Bouraïma A, Zogo B, Sidick I, Corbel V, Pennetier C. Field efficacy of a new deltamethrin long lasting insecticidal net (LifeNet©) against wild pyrethroid-resistant Anopheles gambiae in Benin. BMC Public Health 2018; 18:947. [PMID: 30068334 PMCID: PMC6090760 DOI: 10.1186/s12889-018-5876-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 07/24/2018] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Malaria vector control is mostly based on Long-Lasting Insecticidal Nets (LLIN). To date, all LLINs fully recommended by the World Health Organization Pesticide Scheme (WHOPES) are made of polyester or polyethylene. In this context, a new LLIN named LifeNet©, made of polypropylene fiber is developed. According to the manufacturer, LifeNet©is made of soft filament, has a greater mechanical strength, a superior insecticide wash resistance with a short insecticide regeneration time, a better flammability profile and a better environmental profile compared to polyester or polyethylene nets. METHODS Through a WHOPES supervised trial, the efficacy of LifeNet© was evaluated in Benin in experimental huts against free-flying wild mosquitoes. RESULTS LifeNet© has equal or better performances in terms of wash resistance, exophily, blood feeding inhibition and mortality compared to conventionally treated nets (CTN) treated with deltamethrin at 25 mg/m2 and washed to just before exhaustion. CONCLUSIONS The efficacy of LifeNet© observed in this trial indicates that this net fulfill World Health Organization Pesticide Scheme (WHOPES) requirement for Long Lasting technology in Phase II. Throughout a Phase III trial currently ongoing in Southern Benin, the durability and the acceptability of this long-lasting insecticidal mosquito nets will be assessed under community conditions.
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Affiliation(s)
- Armel Djènontin
- Faculté des Sciences et Techniques-Université d’Abomey-Calavi, Cotonou, Benin
- MIVEGEC, IRD, CNRS, Univ Montpellier, Cotonou, Benin
- Centre de Recherche Entomologique de Cotonou (CREC), Cotonou, Benin
| | - Nicolas Moiroux
- MIVEGEC, IRD, CNRS, Univ Montpellier, Montpellier, France
- IRSS, CNRST, Bobo Dioulasso, Ouagadougou, Burkina Faso
| | - Aziz Bouraïma
- MIVEGEC, IRD, CNRS, Univ Montpellier, Cotonou, Benin
| | - Barnabas Zogo
- MIVEGEC, IRD, CNRS, Univ Montpellier, Cotonou, Benin
| | | | - Vincent Corbel
- MIVEGEC, IRD, CNRS, Univ Montpellier, Montpellier, France
| | - Cédric Pennetier
- MIVEGEC, IRD, CNRS, Univ Montpellier, Montpellier, France
- IPR, INSP, Bouaké, Côte d’Ivoire
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Kayedi MH, Khamisabadi K, Haghdoost AA, Kayedi Z, Fallahi S, Abdali N. Short and long term evaluation of the efficiency of PermaNet® 2.0 bed net against environmental factors and washing using bioassay tests. Rev Inst Med Trop Sao Paulo 2017; 59:e18. [PMID: 28423093 PMCID: PMC5398190 DOI: 10.1590/s1678-9946201759018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Accepted: 02/16/2017] [Indexed: 11/22/2022] Open
Abstract
The aim of the present study was to examine the resistance of PermaNet® 2.0 bed nets against repeated washing and environmental factors by using bioassay tests. After 5, 15 and 21 washings with detergents and by using bioassay tests, the resistance of 40 PermaNet® 2.0 bed nets was compared with that of 40 bed nets conventionally treated with one K-O tablet. To examine the long-term resistance, 31 PermaNet® 2.0 bed nets were also distributed among villagers, and were re-collected to perform bioassay tests after 1, 2 and 5 years. In the first phase of this study, the insecticidal effect of the conventionally-treated nets significantly decreased due to repeated washings (P < 0.001); however, it was not significant regarding PermaNet® 2.0 bed nets (P = 0.92 in continuous exposure and P = 0.12 in mortality tests). In the long-term phase of this study, the time required for knockdown of PermaNet® 2.0 increased over the first 2 years and then decreased. In addition, the mortality rate decreased over the first 2 years and then increased. In conclusion, it seems that the technique used by the manufacturer for impregnation of PermaNet® 2.0 bed nets has an acceptable efficiency in comparison with conventional techniques.
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Affiliation(s)
- Mohammad Hassan Kayedi
- Lorestan University of Medical Sciences, School of Medicine, Department of Parasitology and Mycology, Khorramabad, Iran
| | - Kiumars Khamisabadi
- Tehran University of Medical Sciences, School of Public Health, Kazeroun Field Station, Tehran, Iran.,Iran National Institute of Health Research, Tehran, Iran
| | - Ali Akbar Haghdoost
- Kerman University of Medical Sciences, Institute for Futures Studies in Health, Modeling in Health Research Center, Kerman, Iran
| | - Zohreh Kayedi
- Shiraz University of Medical Sciences, School of Pharmacy, Student Research Committee, Shiraz, Iran
| | - Shirzad Fallahi
- Lorestan University of Medical Sciences, School of Medicine, Department of Parasitology and Mycology, Khorramabad, Iran
| | - Nargess Abdali
- Lorestan University of Medical Sciences, Razi Herbal Medicines Research Center, Student Research Committee, Khorramabad, Iran.,Pasteur Institute of Iran, North Research Center, Amol, Iran
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Seroprevalence of Toxoplasma gondii Infection in Patients with Alzheimer’s Disease. ARCHIVES OF CLINICAL INFECTIOUS DISEASES 2016. [DOI: 10.5812/archcid.37205] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Badolo A, Guelbéogo WM, Tiono AB, Traoré A, Sagnon N, Sirima SB. Laboratory evaluation of Fendona 6SC treated bednets and Interceptor long-lasting nets against Anopheles gambiae s.l. in Burkina Faso. Parasitol Res 2014; 113:1069-75. [PMID: 24425451 DOI: 10.1007/s00436-013-3742-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Accepted: 12/26/2013] [Indexed: 10/25/2022]
Abstract
Insecticide-treated bednets play a cornerstone role in the efforts to control malaria. Bednets entomological efficacy is the determinant factor of their use to control malaria. In this study, we compared under laboratory conditions, the efficacy of two long-lasting nets (PermaNet versus Interceptor) and two treatments kits K-O TAB (deltamethrin) versus Fendona 6SC (alpha-cypermethrin) against Anopheles gambiae s.l. malaria vectors. The efficacy of washed and unwashed bednets was assessed by contact bioassays using World Health Organization (WHO) cones. Three to five-days-old mosquitoes were exposed to the netting for 3 min; the median and 95% knockdown time, the after 24 h mortality was recorded for each type of bednet. The mortality after 24 h was equivalent for the Fendona 6SC treated bednets and the K-O TAB treated bednets [79.4% confidence limits (CL) (73.9-84.6) and 74% CL (68.3-80.0), respectively]. However, the Fendona 6SC treated bednets were superior in 50% knockdown time to the K-O TAB treated bednets [7.8 min, CL (6.5-9.0) and 15. 2 min, CL (14.0-16.4), respectively]. Washed Interceptor and PermaNet bednets showed similar efficacy in terms of 50% knockdown times. Mortality after 24 h was similar from the fifth to the twentieth wash, but PermaNet performed better than Interceptor for the first four washes and for unwashed bednets. This study showed that Fendona 6SC kit and the Interceptor bednets have exhibited consistent comparable efficacy in the laboratory compared to the well known and in use K-O TAB kit and PermaNet bednets.
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Affiliation(s)
- Athanase Badolo
- Centre National de Recherche et de Formation sur le Paludisme (CNRFP), BP 2208, Ouagadougou 01, Burkina Faso,
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Ouattara JPN, Louwagie J, Pigeon O, Spanoghe P. Comparison of the laboratory standard washing using CIPAC washing agent and the domestic washing on three recommended types of long-lasting insecticidal mosquito nets. PLoS One 2013; 8:e74824. [PMID: 24130671 PMCID: PMC3794022 DOI: 10.1371/journal.pone.0074824] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2013] [Accepted: 08/07/2013] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND One of the best ways to prevent malaria is the use of insecticide-treated bed nets. Manufacturers pursue easier, safer and more efficient nets. Hence, many studies on the efficacy and wash resistance using World Health Organization standards have been reported. The commonly used detergent is "Savon de Marseille", because it closely resembles actually used soaps. At the 54(th) Collaborative International Pesticides Analytical Council (CIPAC) Technical Meeting in 2010, it was suggested to replace it by a standardized "CIPAC washing agent". The aim of this study was to investigate the difference between a laboratory hand washing simulation using the CIPAC washing agent (method-1) and a domestic washing (method-2) on different bed nets, as well as the effect of the drying process on the release of active ingredient. METHODS Interceptor®, Permanet®2.0 and Netprotect® nets were used in three treatments, each repeated 20 times. The first treatment included method-1 washing and indoor drying. The second treatment included method-2 washing and indoor drying. The third treatment used method-2 washing and UV-drying. The residual insecticide contents were determined using gas chromatography. RESULTS The washing procedure and the number of washes have a significant effect on the release of active ingredient. Statistically, the two washing methods have the same effect on removing the active ingredient from the Interceptor® and Permanet®2.0 net, but a significantly different influence on the Netprotect® nets. The drying process has no significant effect on the insecticide. CONCLUSION Both washing procedures affected the amount of insecticide remaining on nets independently of the impregnation technology. The active ingredient decreases with the number of washing cycles following an exponential or logarithmic model for coated nets. The laboratory hand washing simulation had more impact on the decrease of active ingredient content of the Netprotect® nets. All net types seemed to be effectively protected against UV-light.
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Affiliation(s)
- Jean Pierre Nabléni Ouattara
- Laboratory of Crop Protection Chemistry, Department of Crop Protection, Ghent University, Gent, Belgium
- Laboratoire National de Santé Publique (LNSP), Boulevard des Tansoba kiéma, Burkina Faso
- * E-mail:
| | | | - Olivier Pigeon
- Walloon Agricultural Research Centre (CRA-W), Agriculture and Natural Environment Department, Plant Protection Products and Biocides Physico-Chemistry and Residues Unit, Gembloux, Belgium
| | - Pieter Spanoghe
- Laboratory of Crop Protection Chemistry, Department of Crop Protection, Ghent University, Gent, Belgium
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Vanlerberghe V, Trongtokit Y, Cremonini L, Jirarojwatana S, Apiwathnasorn C, Van der Stuyft P. Residual insecticidal activity of long-lasting deltamethrin-treated curtains after 1 year of household use for dengue control. Trop Med Int Health 2010; 15:1067-71. [PMID: 20561312 DOI: 10.1111/j.1365-3156.2010.02582.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To evaluate the residual insecticidal activity of the PermaNet(®) curtains on Aedes aegypti after 1 year of use in Thai households and to assess the influence of sun and dust exposure, washing practices and detergent use. METHODS We sampled UV-protected PermaNet(®) curtains made of a long-lasting deltamethrin-[55 mg/m(2)] treated polyester netting, before (10 curtains) and after 8 (10 curtains) and 12 months (66 curtains) of household use in a field site in Chon Buri, Thailand. We assessed the residual insecticidal activity of the curtains by standard WHO bioassay, using a deltamethrin-susceptible insectarium Aedes aegypti strain. RESULTS Mosquito mortality was 100% before distribution, 100% at 8 months and 98.2% (95% CI 97.9-98.5) at 12 months of use. Sunlight, hand-washing and detergent use had no effect on the residual insecticidal activity after 12 months. However, the mosquito survival rate increased by a factor of 6.4 (95% CI 3.5-11.8) on machine-washed curtains and by a factor of 2.0 (95% CI 1.4-2.9) on curtains not covered by dust. CONCLUSION The residual insecticidal activity of PermaNet® curtains remains high after 12 months use under field conditions.
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Affiliation(s)
- V Vanlerberghe
- Epidemiology and Disease Control Unit, Institute of Tropical Medicine, Antwerp, Belgium.
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