19 results on '"Moore, Sarah J."'
Search Results
2. Comparison of the Trapping Efficacy of Locally Modified Gravid Aedes Trap and Autocidal Gravid Ovitrap for the Monitoring and Surveillance of Aedes aegypti Mosquitoes in Tanzania.
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Machange, Jane Johnson, Maasayi, Masudi Suleiman, Mundi, John, Moore, Jason, Muganga, Joseph Barnabas, Odufuwa, Olukayode G., Moore, Sarah J., and Tenywa, Frank Chelestino
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AEDES aegypti ,AEDES ,MOSQUITO control ,MOSQUITOES ,INSECTICIDE-treated mosquito nets ,MAGIC squares ,MOSQUITO vectors - Abstract
Simple Summary: Mosquito traps are widely used for the monitoring and surveillance of mosquito vectors in many mosquito-borne disease-endemic countries. However, the costs and efficacy of traps remain a great challenge. In this study, we compared the trapping efficacy of locally modified Gravid Aedes Trap (GAT) and Autocidal Gravid Ovitrap (AGO) for dengue vector (Aedes aegypti) in a semi-field and field settings. The GAT was lined with pyrethroid-treated nets as a killing agent, while the AGO adhered with a sticky board to capture mosquitoes. We also compared the locally modified traps baited with either yeast or grass infusion with BG-Sentinel (BGS) with BG lure (a standard trap for capturing Aedes mosquitoes). Our findings showed that the GAT was more efficacious than the AGO in both semi-field and field settings. Additionally, there was no significant difference between yeast-baited and grass-baited GAT traps in capturing mosquitoes, although yeast was easier to use. When compared to a standard trap (BGS), GAT showed no difference in capturing Aedes mosquitoes in a semi-field; however, in the field setting, BGS outperformed the modified GAT. The study assessed the trapping efficacy of locally modified (1) Gravid Aedes Trap (GAT) lined with insecticide-treated net (ITN) as a killing agent and (2) Autocidal Gravid Ovitrap (AGO) with sticky board in the semi-field system (SFS) and field setting. Fully balanced Latin square experiments were conducted to compare GAT lined with ITN vs. AGO, both with either yeast or grass infusion. Biogent-Sentinel (BGS) with BG-Lure and no CO
2 was used as a standard trap for Aedes mosquitoes. In the SFS, GAT outperformed AGO in collecting both nulliparous (65% vs. 49%, OR = 2.22, [95% CI: 1.89–2.60], p < 0.001) and gravid mosquitoes (73% vs. 64%, OR = 1.67, [95% CI: 1.41–1.97], p < 0.001). Similar differences were observed in the field. Yeast and grass infusion did not significantly differ in trapping gravid mosquitoes (OR = 0.91, [95% CI: 0.77–1.07], p = 0.250). The use of ITN improved mosquito recapture from 11% to 70% in the SFS. The same trend was observed in the field. Yeast was chosen for further evaluation in the optimized GAT due to its convenience and bifenthrin net for its resistance management properties. Mosquito density was collected when using 4× GATs relative to BGS-captured gravid mosquitoes 64 vs. 58 (IRR = 0.82, [95% CI: 0.35–1.95], p = 0.658) and showed no density dependence. Deployment of multiple yeast-baited GAT lined with bifenthrin net is cost-effective (single GAT < $8) compared to other traps such as BGS ($160). [ABSTRACT FROM AUTHOR]- Published
- 2024
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3. Predicting the impact of outdoor vector control interventions on malaria transmission intensity from semi-field studies
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Denz, Adrian, Njoroge, Margaret M., Tambwe, Mgeni M., Champagne, Clara, Okumu, Fredros, van Loon, Joop J. A., Hiscox, Alexandra, Saddler, Adam, Fillinger, Ulrike, Moore, Sarah J., and Chitnis, Nakul
- Published
- 2021
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4. A randomized, double-blind placebo-control study assessing the protective efficacy of an odour-based 'push–pull' malaria vector control strategy in reducing human-vector contact.
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Fillinger, Ulrike, Denz, Adrian, Njoroge, Margaret M., Tambwe, Mohamed M., Takken, Willem, van Loon, Joop J. A., Moore, Sarah J., Saddler, Adam, Chitnis, Nakul, and Hiscox, Alexandra
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MALARIA prevention ,MOSQUITO control ,INSECTICIDE-treated mosquito nets ,VECTOR control ,ANOPHELES arabiensis ,ANOPHELES - Abstract
Novel malaria vector control strategies targeting the odour-orientation of mosquitoes during host-seeking, such as 'attract-and-kill' or 'push-and-pull', have been suggested as complementary tools to indoor residual spraying and long-lasting insecticidal nets. These would be particularly beneficial if they can target vectors in the peri-domestic space where people are unprotected by traditional interventions. A randomized double-blind placebo-control study was implemented in western Kenya to evaluate: a 'push' intervention (spatial repellent) using transfluthrin-treated fabric strips positioned at open eave gaps of houses; a 'pull' intervention placing an odour-baited mosquito trap at a 5 m distance from a house; the combined 'push–pull' package; and the control where houses contained all elements but without active ingredients. Treatments were rotated through 12 houses in a randomized-block design. Outdoor biting was estimated using human landing catches, and indoor mosquito densities using light-traps. None of the interventions provided any protection from outdoor biting malaria vectors. The 'push' reduced indoor vector densities dominated by Anopheles funestus by around two thirds. The 'pull' device did not add any benefit. In the light of the high Anopheles arabiensis biting densities outdoors in the study location, the search for efficient outdoor protection and effective pull components needs to continue. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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5. Semi-field evaluation of the exposure-free mosquito electrocuting trap and BG-Sentinel trap as an alternative to the human landing catch for measuring the efficacy of transfluthrin emanators against Aedes aegypti.
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Tambwe, Mgeni M., Saddler, Adam, Kibondo, Ummi Abdul, Mashauri, Rajabu, Kreppel, Katharina S., Govella, Nicodem J., and Moore, Sarah J.
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AEDES aegypti ,MOSQUITOES ,PYRETHROIDS ,VECTOR control ,HUMAN beings - Abstract
Background: The human landing catch (HLC) measures human exposure to mosquito bites and evaluates the efficacy of vector control tools. However, it may expose volunteers to potentially infected mosquitoes. The mosquito electrocuting trap (MET) and BG-Sentinel traps (BGS) represent alternative, exposure-free methods for sampling host-seeking mosquitoes. This study investigates whether these methods can be effectively used as alternatives to HLC for measuring the efficacy of transfluthrin emanator against Aedes aegypti. Methods: The protective efficacy (PE) of freestanding passive transfluthrin emanators (FTPEs), measured by HLC, MET and BGS, was compared in no-choice and choice tests. The collection methods were conducted 2 m from an experimental hut with FTPEs positioned at 3 m on either side of them. For the choice experiment, a competitor HLC was included 10 m from the first collection point. One hundred laboratory-reared Ae. aegypti mosquitoes were released and collected for 3 consecutive h. Results: In the no-choice test, each method measured similar PE: HLC: 66% (95% confidence interval [CI]: 50–82), MET: 55% (95% CI: 48–63) and BGS: 64% (95% CI: 54–73). The proportion of mosquitoes recaptured was consistent between methods (20–24%) in treatment and varied (47–71%) in the control. However, in choice tests, the PE measured by each method varied: HLC: 37% (95% CI: 25–50%), MET: 76% (95% CI: 61–92) and BGS trap: 0% (95% CI: 0–100). Recaptured mosquitoes were no longer consistent between methods in treatment (2–26%) and remained variable in the control (7–42%). FTPE provided 50% PE to the second HLC 10 m away. In the control, the MET and the BGS were less efficacious in collecting mosquitoes in the presence of a second HLC. Conclusions: Measuring the PE in isolation was fairly consistent for HLC, MET and BGS. Because HLC is not advisable, it is reasonable to use either MET or BGS as a proxy for HLC for testing volatile pyrethroid (VP) in areas of active arbovirus-endemic areas. The presence of a human host in close proximity invalidated the PE estimates from BGS and METs. Findings also indicated that transfluthrin can protect multiple people in the peridomestic area and that at short range mosquitoes select humans over the BGS. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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6. Spatial repellents: from discovery and development to evidence-based validation
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Achee Nicole L, Bangs Michael J, Farlow Robert, Killeen Gerry F, Lindsay Steve, Logan James G, Moore Sarah J, Rowland Mark, Sweeney Kevin, Torr Steve J, Zwiebel Laurence J, and Grieco John P
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Public health ,Spatial repellents ,Vector control ,Vector behaviour modification ,Arctic medicine. Tropical medicine ,RC955-962 ,Infectious and parasitic diseases ,RC109-216 - Abstract
Abstract International public health workers are challenged by a burden of arthropod-borne disease that remains elevated despite best efforts in control programmes. With this challenge comes the opportunity to develop novel vector control paradigms to guide product development and programme implementation. The role of vector behaviour modification in disease control was first highlighted several decades ago but has received limited attention within the public health community. This paper presents current evidence highlighting the value of sub-lethal agents, specifically spatial repellents, and their use in global health, and identifies the primary challenges towards establishing a clearly defined and recommended role for spatial repellent products in disease control.
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- 2012
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7. Repellents and New 'Spaces of Concern' in Global Health
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Kelly, Ann H., Koudakossi, Hermione N. Boko, and Moore, Sarah J.
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Insecticides ,Mosquito Control ,Anthropology, Medical ,fungi ,domestic space ,global health innovation ,malaria ,vector control ,Articles ,vector-control ,Global Health ,Article ,United States ,resistance ,South Africa ,parasitic diseases ,Animals ,Humans ,Insecticide-Treated Bednets ,Domestic space - Abstract
Today, malaria prevention hinges upon two domestic interventions: insecticide-treated bed nets and indoor residual spraying. As mosquitoes grow resistant to these tools, however, novel approaches to vector control have become a priority area of malaria research and development. Spatial repellency, a volumetric mode of action that seeks to reduce disease transmission by creating an atmosphere inimical to mosquitoes, represents one way forward. Drawing from research that sought to develop new repellent chemicals in conversation with users from sub-Saharan Africa and the United States, we consider the implications of a non-insecticidal paradigm of vector control for how we understand the political ecology of malaria.
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- 2017
8. Opera&onal Research :Valida&on of the 'Ifakara Tunnel Repellent Tes&ng Assay' for evalua&on of pyrethroid treated clothing
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Mlacha, Yeromin P, Mohamed, Mgeni, Msellemu, Daniel, and Moore, Sarah J
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Vector control - Published
- 2016
9. Durability (attrition, bio-efficacy, chemical residue and physical integrity) of Olyset® nets from distribution campaigns in eight districts of Tanzania
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Massue, Dennis J, Moore, Sarah J, Mageni, Zawadi D, Moore, Jason, Pigeon, Olivier, Bradley, John, Maziba, Erasto J, Mandike, Renata, Kramer, Karen, Kisinza, William N, Overgaard, Hans J, and Lorenz, Lena M.
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Vector control - Published
- 2016
10. Randomized Control Trial of Permethrin Treated Uniforms (PTU) and 30% DEET Skin Repellents to Reduce Malaria Incidence in Military Personnel on Active Duty in Regions of Hyperendemicity
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Moore, Sarah J, Msellemu, Daniel, Wurapa, Eyako, Anova, Lalaine, Szumlas, Daniel, and Richardson, Jason
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Vector control - Published
- 2016
11. Mosquito feeding behavior and how it influences residual malaria transmission across Africa.
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Sherrard-Smith, Ellie, Skarp, Janetta E., Beale, Andrew D., Fornadel, Christen, Norris, Laura C., Moore, Sarah J., Mihreteab, Selam, Charlwood, Jacques Derek, Bhatt, Samir, Winskill, Peter, Griffin, Jamie T., and Churcher, Thomas S.
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MALARIA ,MOSQUITOES ,HUMAN behavior ,VECTOR control ,META-analysis - Abstract
The antimalarial efficacy of the most important vector control interventions--long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS)--primarily protect against mosquitoes' biting people when they are in bed and indoors. Mosquito bites taken outside of these times contribute to residual transmission which determines the maximum effectiveness of current malaria prevention. The likelihood mosquitoes feed outside the time of day when LLINs and IRS can protect people is poorly understood, and the proportion of bites received outdoors may be higher after prolonged vector control. A systematic review of mosquito and human behavior is used to quantify and estimate the public health impact of outdoor biting across Africa. On average 79% of bites by the major malaria vectors occur during the time when people are in bed. This estimate is substantially lower than previous predictions, with results suggesting a nearly 10% lower proportion of bites taken at the time when people are beneath LLINs since the year 2000. Across Africa, this higher outdoor transmission is predicted to result in an estimated 10.6 million additional malaria cases annually if universal LLIN and IRS coverage was achieved. Higher outdoor biting diminishes the cases of malaria averted by vector control. This reduction in LLIN effectiveness appears to be exacerbated in areas where mosquito populations are resistant to insecticides used in bed nets, but no association was found between physiological resistance and outdoor biting. Substantial spatial heterogeneity in mosquito biting behavior between communities could contribute to differences in effectiveness of malaria control across Africa. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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12. Spatial Repellents for the Control of Malaria Mosquitoes in Africa
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Ogoma, Sheila, Moore, Jason, Lorenz, Lena, Maia, Marta, and Moore, Sarah J
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Vector control - Published
- 2012
13. Vector Control Product Evaluations Collaborative Group
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Ogoma, Sheila, Okumu, Fredros, Sangoro, Peter, Logan, James, Maia, Marta, Lorenz, Lena, and Moore, Sarah J
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parasitic diseases ,Vector control - Published
- 2012
14. Relative performance of indoor vector control interventions in the Ifakara and the West African experimental huts.
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Oumbouke, Welbeck A., Fongnikin, Augustin, Soukou, Koffi B., Moore, Sarah J., and N'Guessan, Raphael
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VECTOR control ,MOSQUITO control ,MOSQUITO vectors ,PYRETHROIDS ,PUBLIC health - Abstract
Background: West African and Ifakara experimental huts are used to evaluate indoor mosquito control interventions, including spatial repellents and insecticides. The two hut types differ in size and design, so a side-by-side comparison was performed to investigate the performance of indoor interventions in the two hut designs using standard entomological outcomes: relative indoor mosquito density (deterrence), exophily (induced exit), blood-feeding and mortality of mosquitoes. Methods: Metofluthrin mosquito coils (0.00625% and 0.0097%) and Olyset® Net vs control nets (untreated, deliberately holed net) were evaluated against pyrethroid-resistant Culex quinquefasciatus in Benin. Four experimental huts were used: two West African hut designs and two Ifakara hut designs. Treatments were rotated among the huts every four nights until each treatment was tested in each hut 52 times. Volunteers rotated between huts nightly. Results: The Ifakara huts caught a median of 37 Culex quinquefasciatus/night, while the West African huts captured a median of 8/night (rate ratio 3.37, 95% CI: 2.30-4.94, P < 0.0001) and this difference in mosquito entry was similar for Olyset® Net and more pronounced for spatial repellents. Exophily was greater in the Ifakara huts with > 4-fold higher mosquito exit relative to the West African huts (odds ratio 4.18, 95% CI: 3.18-5.51, P < 0.0001), regardless of treatment. While blood-feeding rates were significantly higher in the West African huts, mortality appeared significantly lower for all treatments. Conclusions: The Ifakara hut captured more Cx. quinquefasciatus that could more easily exit into windows and eave traps after failing to blood-feed, compared to the West African hut. The higher mortality rates recorded in the Ifakara huts could be attributable to the greater proportions of Culex mosquitoes exiting and probably dying from starvation, relative to the situation in the West African huts. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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15. The Mode of Action of Spatial Repellents and Their Impact on Vectorial Capacity of Anopheles gambiae sensu stricto.
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Ogoma, Sheila B., Ngonyani, Hassan, Simfukwe, Emmanuel T., Mseka, Antony, Moore, Jason, Maia, Marta F., Moore, Sarah J., and Lorenz, Lena M.
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MALARIA transmission ,ANOPHELES ,VECTOR control ,INSECTICIDES ,MOSQUITO vectors ,PYRETHROIDS - Abstract
Malaria vector control relies on toxicity of insecticides used in long lasting insecticide treated nets and indoor residual spraying. This is despite evidence that sub–lethal insecticides reduce human–vector contact and malaria transmission. The impact of sub–lethal insecticides on host seeking and blood feeding of mosquitoes was measured. Taxis boxes distinguished between repellency and attraction inhibition of mosquitoes by measuring response of mosquitoes towards or away from Transfluthrin coils and humans. Protective effective distance of coils and long-term effects on blood feeding were measured in the semi–field tunnel and in a Peet Grady chamber. Laboratory reared pyrethroid susceptible Anopheles gambiae sensu stricto mosquitoes were used. In the taxis boxes, a higher proportion of mosquitoes (67%–82%) were activated and flew towards the human in the presence of Transfluthrin coils. Coils did not hinder attraction of mosquitoes to the human. In the semi–field Tunnel, coils placed 0.3 m from the human reduced feeding by 86% (95% CI [0.66; 0.95]) when used as a “bubble” compared to 65% (95% CI [0.51; 0.76]) when used as a “point source”. Mosquitoes exposed to coils inside a Peet Grady chamber were delayed from feeding normally for 12 hours but there was no effect on free flying and caged mosquitoes exposed in the semi–field tunnel. These findings indicate that airborne pyrethroids minimize human–vector contact through reduced and delayed blood feeding. This information is useful for the development of target product profiles of spatial repellent products that can be used to complement mainstream malaria vector control tools. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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16. Simplified Models of Vector Control Impact upon Malaria Transmission by Zoophagic Mosquitoes.
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Kiware, Samson S., Chitnis, Nakul, Moore, Sarah J., Devine, Gregor J., Majambere, Silas, Merrill, Stephen, and Killeen, Gerry F.
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MOSQUITO vectors ,MALARIA transmission ,VECTOR control ,PREVENTION of communicable diseases ,PROTOZOAN diseases - Abstract
Background: High coverage of personal protection measures that kill mosquitoes dramatically reduce malaria transmission where vector populations depend upon human blood. However, most primary malaria vectors outside of sub-Saharan Africa can be classified as "very zoophagic,'' meaning they feed occasionally (<10% of blood meals) upon humans, so personal protection interventions have negligible impact upon their survival. Methods and Findings: We extended a published malaria transmission model to examine the relationship between transmission, control, and the baseline proportion of bloodmeals obtained from humans (human blood index). The lower limit of the human blood index enables derivation of simplified models for zoophagic vectors that (1) Rely on only three field-measurable parameters. (2) Predict immediate and delayed (with and without assuming reduced human infectivity, respectively) impacts of personal protection measures upon transmission. (3) Illustrate how appreciable indirect communallevel protection for non-users can be accrued through direct personal protection of users. (4) Suggest the coverage and efficacy thresholds required to attain epidemiological impact. The findings suggest that immediate, indirect, communitywide protection of users and non-users alike may linearly relate to the efficacy of a user's direct personal protection, regardless of whether that is achieved by killing or repelling mosquitoes. High protective coverage and efficacy ($80%) are important to achieve epidemiologically meaningful impact. Non-users are indirectly protected because the two most common species of human malaria are strict anthroponoses. Therefore, the small proportion of mosquitoes that are killed or diverted while attacking humans can represent a large proportion of those actually transmitting malaria. Conclusions: Simplified models of malaria transmission by very zoophagic vectors may be used by control practitioners to predict intervention impact interventions using three field-measurable parameters; the proportion of human exposure to mosquitoes occurring when an intervention can be practically used, its protective efficacy when used, and the proportion of people using it. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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17. A Modified Experimental Hut Design for Studying Responses of Disease-Transmitting Mosquitoes to Indoor Interventions: The Ifakara Experimental Huts.
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Okumu, Fredros O., Moore, Jason, Mbeyela, Edgar, Sherlock, Mark, Sangusangu, Robert, Ligamba, Godfrey, Russell, Tanya, and Moore, Sarah J.
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MOSQUITOES ,INFECTIOUS disease transmission ,VECTOR control ,INSECTICIDES ,HUTS ,ANOPHELES gambiae ,TRAPPING ,WALL panels ,BUILDING design & construction - Abstract
Differences between individual human houses can confound results of studies aimed at evaluating indoor vector control interventions such as insecticide treated nets (ITNs) and indoor residual insecticide spraying (IRS). Specially designed and standardised experimental huts have historically provided a solution to this challenge, with an added advantage that they can be fitted with special interception traps to sample entering or exiting mosquitoes. However, many of these experimental hut designs have a number of limitations, for example: 1) inability to sample mosquitoes on all sides of huts, 2) increased likelihood of live mosquitoes flying out of the huts, leaving mainly dead ones, 3) difficulties of cleaning the huts when a new insecticide is to be tested, and 4) the generally small size of the experimental huts, which can misrepresent actual local house sizes or airflow dynamics in the local houses. Here, we describe a modified experimental hut design - The Ifakara Experimental Huts- and explain how these huts can be used to more realistically monitor behavioural and physiological responses of wild, free-flying disease-transmitting mosquitoes, including the African malaria vectors of the species complexes Anopheles gambiae and Anopheles funestus, to indoor vector control-technologies including ITNs and IRS. Important characteristics of the Ifakara experimental huts include: 1) interception traps fitted onto eave spaces and windows, 2) use of eave baffles (panels that direct mosquito movement) to control exit of live mosquitoes through the eave spaces, 3) use of replaceable wall panels and ceilings, which allow safe insecticide disposal and reuse of the huts to test different insecticides in successive periods, 4) the kit format of the huts allowing portability and 5) an improved suite of entomological procedures to maximise data quality. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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18. Establishment of a large semi-field system for experimental study of African malaria vector ecology and control in Tanzania.
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Ferguson, Heather M., Ng'habi, Kija R., Walder, Thomas, Kadungula, Demetrius, Moore, Sarah J., Lyimo, Issa, Russell, Tanya L., Urassa, Honorathy, Mshinda, Hassan, Killeen, Gerry F., and Knols, Bart G. J.
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MALARIA ,DISEASE vectors ,ANIMAL ecology ,VECTOR control ,PREVENTION of communicable diseases - Abstract
Background: Medical entomologists increasingly recognize that the ability to make inferences between laboratory experiments of vector biology and epidemiological trends observed in the field is hindered by a conceptual and methodological gap occurring between these approaches which prevents hypothesis-driven empirical research from being conducted on relatively large and environmentally realistic scales. The development of Semi-Field Systems (SFS) has been proposed as the best mechanism for bridging this gap. Semi-field systems are defined as enclosed environments, ideally situated within the natural ecosystem of a target disease vector and exposed to ambient environmental conditions, in which all features necessary for its life cycle completion are present. Although the value of SFS as a research tool for malaria vector biology is gaining recognition, only a few such facilities exist worldwide and are relatively small in size (< 100 m²). Methods: The establishment of a 625 m² state-of-the-art SFS for large-scale experimentation on anopheline mosquito ecology and control within a rural area of southern Tanzania, where malaria transmission intensities are amongst the highest ever recorded, is described. Results: A greenhouse frame with walls of mosquito netting and a polyethylene roof was mounted on a raised concrete platform at the Ifakara Health Institute. The interior of the SFS was divided into four separate work areas that have been set up for a variety of research activities including mass-rearing for African malaria vectors under natural conditions, high throughput evaluation of novel mosquito control and trapping techniques, short-term assays of host-seeking behaviour and olfaction, and longer-term experimental investigation of anopheline population dynamics and gene flow within a contained environment that simulates a local village domestic setting. Conclusion: The SFS at Ifakara was completed and ready for use in under two years. Preliminary observations indicate that realistic and repeatable observations of anopheline behaviour are obtainable within the SFS, and that habitat and climatic features representative of field conditions can be simulated within it. As work begins in the SFS in Ifakara and others around the world, the major opportunities and challenges to the successful application of this tool for malaria vector research and control are discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
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19. Targeting Outdoor-biting Malaria vectors Using Odour-baited Mosquito Landing Boxes (MLB) Fitted with Low-cost Electrocuting Grids
- Author
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Matowo, Nancy S., Moore, Sarah J., Koekemoer, Lizette L., Mapua, Salum, Coetzee, Maureen, and Okumu, Fredros O.
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Vector control
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