Academic literature on the topic 'Long lasting insecticidal treated nets (LLINs)'

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Journal articles on the topic "Long lasting insecticidal treated nets (LLINs)"

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Akoton, Romaric, Genevieve M. Tchigossou, Innocent Djègbè, Akadiri Yessoufou, Michael Seun Atoyebi, Eric Tossou, Francis Zeukeng, et al. "Experimental huts trial of the efficacy of pyrethroids/piperonyl butoxide (PBO) net treatments for controlling multi-resistant populations of Anopheles funestus s.s. in Kpomè, Southern Benin." Wellcome Open Research 3 (June 13, 2018): 71. http://dx.doi.org/10.12688/wellcomeopenres.14589.1.

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Background: Insecticides resistance in Anopheles mosquitoes limits Long-Lasting Insecticidal Nets (LLIN) used for malaria control in Africa, especially Benin. This study aimed to evaluate the bio-efficacy of current LLINs in an area where An. funestus s.l. and An. gambiae have developed multi-resistance to insecticides, and to assess in experimental huts the performance of a mixed combination of pyrethroids and piperonyl butoxide (PBO) treated nets on these resistant mosquitoes. Methods: The study was conducted at Kpomè, Southern Benin. The bio-efficacy of LLINs against An. funestus and An. gambiae was assessed using the World Health Organization (WHO) cone and tunnel tests. A released/recapture experiment following WHO procedures was conducted to compare the efficacy of conventional LLINs treated with pyrethroids only and LLINs with combinations of pyrethroids and PBO. Prior to huts trials, we confirmed the level of insecticide and PBO residues in tested nets using high performance liquid chromatography (HPLC). Results: Conventional LLINs (Type 2 and Type 4) have the lowest effect against local multi-resistant An. funestus s.s. and An. coluzzii populations from Kpomè. Conversely, when LLINs containing mixtures of pyrethroids and PBO (Type 1 and Type 3) were introduced in trial huts, we recorded a greater effect against the two mosquito populations (P < 0.0001). Tunnel test with An. funestus s.s. revealed mortalities of over 80% with this new generation of LLINs (Type 1 and Type 3),while conventional LLINs produced 65.53 ± 8.33% mortalities for Type 2 and 71.25 ±7.92% mortalities for Type 4. Similarly, mortalities ranging from 77 to 87% were recorded with the local populations of An. coluzzii. Conclusion: This study suggests the reduced efficacy of conventional LLINs (Pyrethroids alone) currently distributed in Benin communities where Anopheles populations have developed multi-insecticide resistance. The new generation nets (pyrethroids+PBO) proved to be more effective on multi-resistant populations of mosquitoes.
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Thandar, Aye Mya, Phyo Wai Win, Soe Soe Htwe, and Maung Maung Mya Mya. "The Efficacy of Long Lasting Insecticidal Nets (LLINs) and Insecticide Treated Nets against Anopheles Mosquitoes." Journal of Diseases 6, no. 2 (2019): 34–53. http://dx.doi.org/10.18488/journal.99.2019.62.34.53.

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Mosha, Jacklin F., Manisha A. Kulkarni, Louisa A. Messenger, Mark Rowland, Nancy Matowo, Catherine Pitt, Eliud Lukole, et al. "Protocol for a four parallel-arm, single-blind, cluster-randomised trial to assess the effectiveness of three types of dual active ingredient treated nets compared to pyrethroid-only long-lasting insecticidal nets to prevent malaria transmitted by pyrethroid insecticide-resistant vector mosquitoes in Tanzania." BMJ Open 11, no. 3 (March 2021): e046664. http://dx.doi.org/10.1136/bmjopen-2020-046664.

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IntroductionThe massive scale-up of long-lasting insecticidal nets (LLINs) has led to major reductions in malaria burden in many sub-Saharan African countries. This progress is threatened by widespread insecticide resistance among malaria vectors. This cluster-randomised controlled trial (c-RCT) compares three of the most promising dual active ingredients LLINs (dual-AI LLINs), which incorporate mixtures of insecticides or insecticide synergists to standard LLINs in an area of pyrethroid insecticide resistance.MethodsA four-arm, single-blinded, c-RCT will evaluate the effectiveness of three types of dual-AI LLINs (1) Royal Guard, combining two insecticides, pyriproxyfen and the pyrethroid alpha-cypermethrin; (2) Interceptor G2, combining chlorfenapyr and alpha-cypermethrin; (3) Olyset Plus, an LLIN combining a synergist, piperonyl butoxide and the pyrethroid permethrin, compared with; (4) Interceptor LN, a standard LLIN containing the pyrethroid alpha-cypermethrin as the sole AI. The primary outcomes are malaria infection prevalence in children aged 6 months–14 years and entomological inoculation rate (EIR), as a standard measure of malaria transmission at 24 months postintervention and cost-effectiveness.Ethics and disseminationEthical approval was received from the institutional review boards of the Tanzanian National Institute for Medical Research, Kilimanjaro Christian Medical University College, London School of Hygiene and Tropical Medicine, and University of Ottawa. Study findings will be actively disseminated via reports and presentations to stakeholders, local community leaders, and relevant national and international policy makers as well as through conferences, and peer-reviewed publications.Trial registration numberNCT03554616.
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Touré, Mahama, Pierre Carnevale, and Fabrice Chandre. "Impact of Long-Lasting Insecticidal Nets and Indoor Residual Sprayings on Susceptibility of Anopheles gambiae (Diptera: Culicidae) in Western Côte d'Ivoire." ISRN Infectious Diseases 2013 (December 17, 2013): 1–7. http://dx.doi.org/10.5402/2013/914714.

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Pyrethroid insecticides resistance in several Anopheles species represents a threat for the success of malaria vector control based on using treated nets and indoor sprayings. Impact of the long-lasting insecticidal net (LLIN) of Permanet type and indoor residual spraying (IRS) with deltamethrin on the levels of susceptibility to pyrethroids and DDT were investigated in field populations of Anopheles gambiae in 12 villages located in the Danané area in Western Côte d'Ivoire. From May 2001 to July 2002, adult An. gambiae reared from larvae collected from these villages were tested with 0.05% deltamethrin, 1% permethrin, and 4% DDT impregnated papers using WHO standard test kits. Knockdown times for 50% of adult mosquitoes (kdT50) of field specimens from LLINs, untreated nets, IRS, and control villages significantly differed from those of the Kisumu susceptible strain. However, the resistance ratios of the kdT50 were very low. KdT50 did not significantly differ with all treatments, chemicals (LLINs and IRS), physical (untreated nets), and control. The mortalities were above 80% indicating susceptible populations of An. gambiae in the Danané area. There was no significant difference between mortality rates from the different treatments.
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Omar, A. S., B. Son, and F. Wambalaba. "IMPLICATIONS OF LONG-LASTING INSECTICIDE-TREATED BED NETS (LLINs) FOR MALARIA CONTROL AND PREVENTION IN SOMALIA." African Journal of Health, Safety and Environment 2, no. 2 (September 21, 2021): 82–90. http://dx.doi.org/10.52417/ajhse.v2i2.146.

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In Sub-Saharan Africa, bed nets are mainly aimed at the prevention of the nuisance of mosquito biting rather than against malaria. The species that are involved in malaria infection are all present in Somalia with the leading one being Plasmodium falciparum that causes about 98% of all infections in the country. This alarming spread of malaria underscores the need to develop interventions that can effectively curb the malaria menace. This study sought to examine the implications of the utilization of long-lasting insecticide-treated bed nets (LLINs) for malaria control and prevention. The population constituted 1,100 pregnant women attending MCH clinics and the two thousand two hundred heads of households, totalling three thousand three hundred. A simple random sampling technique was used to obtain a representative sample of households. In surveying 110 pregnant women attending Maternal Child Health (MCH) clinics and 220 heads of households in the Belet Hawo district in Somalia in 2019, the study found that the majority of households knew the effect of LLINs on preventing malaria. They were also knowledgeable about how to control malaria while facing limited access to LLINs. Furthermore, LLIN usage helped households to raise awareness and knowledge about the effect of LLINs on preventing malaria. This study provided the Somalian government with a better understanding of the causes, control, and prevention of malaria.
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Vieira, Gabriel de Deus, Sergio de Almeida Basano, Tony Hiroshi Katsuragawa, and Luís Marcelo Aranha Camargo. "INSECTICIDE-TREATED BED NETS IN RONDÔNIA, BRAZIL: EVALUATION OF THEIR IMPACT ON MALARIA CONTROL." Revista do Instituto de Medicina Tropical de São Paulo 56, no. 6 (December 2014): 493–97. http://dx.doi.org/10.1590/s0036-46652014000600007.

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Mosquito nets treated with long-lasting insecticide (LLINs), when used in compliance with guidelines of the World Health Organization, may be effective for malaria vector control. In 2012, approximately 150,000 LLINs were installed in nine municipalities in the state of Rondônia. However, no studies have assessed their impact on the reduction of malaria incidence. This study analyzed secondary data of malaria incidence, in order to assess the impact of LLINs on the annual parasite incidence (API). The results showed no statistically significant differences in API one year after LLIN installation when compared to municipalities without LLINs. The adoption of measures for malaria vector control should be associated with epidemiological studies and evaluations of their use and efficiency, with the aim of offering convincing advantages that justify their implementation and limit malaria infection in the Amazon Region.
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Ladi-Akinyemi, Temitope 'Wunmi, Babatunde Oladipupo Ladi-Akinyemi, Adedoyin Oyeyimika Ogunyemi, and Frances Ademola Oluwole. "A rural-urban comparison of ownership and utilization of Long-Lasting Insecticide Treated Nets among pregnant women in Ogun State Nigeria." Annals of Health Research 5, no. 1 (June 1, 2019): 36–50. http://dx.doi.org/10.30442/ahr.0501-5-35.

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Background: The use of Long-Lasting Insecticide Treated Nets (LLINs) in Africa increased mean birth weight by 55g, reduced the incidence of low birth weight by 23% and decreased miscarriages/stillbirths by 33%. However, the benefit of the LLINs may be limited by the rate of ownership and utilization by pregnant women. Objective: To determine and compare the ownership and utilization of LLINs among pregnant women in urban and rural areas of Ogun State. Methods: A community-based comparative cross-sectional study on 72 and 74 pregnant women living in urban and rural areas, respectively of Ogun State was carried out. Using a multi-stage cluster sampling technique and a pretested semi-structured interviewer-administered questionnaire, information on LLINs ownership and use were obtained. Results: Ownership of LLINs was 81.1% in rural areas compared to 66.7% in urban areas. About 65% of participants in rural versus 44.4% in urban areas slept under LLINs. The predictor of ownership of LLIN was age group 15-24 years [AOR 0.10 (95%CI 0.01 - 0.56)]. The predictors of utilization of LLINs included urban residence [AOR 0.29 (95%CI 0.13 – 0.65)], age group 15-24 years [AOR 0.17 (95%CI 0.04 – 0.70)], registration of pregnancy for antenatal care [AOR 5.12 (95%CI 1.14 – 23.03)] and knowledge on prevention of malaria [AOR 4.94 (95%CI 1.51 – 16.17)]. Conclusion: Pregnant women should visit ANC clinics regularly, and health education on malaria should focus more on the prevention of malaria as well as encouraging the consistent use of the nets, particularly in the urban areas.
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Topazian, Hillary M., Austin Gumbo, Katerina Brandt, Michael Kayange, Jennifer S. Smith, Jessie K. Edwards, Varun Goel, et al. "Effectiveness of a national mass distribution campaign of long-lasting insecticide-treated nets and indoor residual spraying on clinical malaria in Malawi, 2018–2020." BMJ Global Health 6, no. 5 (May 2021): e005447. http://dx.doi.org/10.1136/bmjgh-2021-005447.

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IntroductionMalawi’s malaria burden is primarily assessed via cross-sectional national household surveys. However, malaria is spatially and temporally heterogenous and no analyses have been performed at a subdistrict level throughout the course of a year. The WHO recommends mass distribution of long-lasting insecticide-treated bed nets (LLINs) every 3 years, but a national longitudinal evaluation has never been conducted in Malawi to determine LLIN effectiveness lifespans.MethodsUsing District Health Information Software 2 (DHIS2) health facility data, available from January 2018 to June 2020, we assessed malaria risk before and after a mass distribution campaign, stratifying by age group and comparing risk differences (RDs) by LLIN type or annual application of indoor residual spraying (IRS).Results711 health facilities contributed 20 962 facility reports over 30 months. After national distribution of 10.7 million LLINs and IRS in limited settings, malaria risk decreased from 25.6 to 16.7 cases per 100 people from 2018 to 2019 high transmission seasons, and rebounded to 23.2 in 2020, resulting in significant RDs of −8.9 in 2019 and −2.4 in 2020 as compared with 2018. Piperonyl butoxide (PBO)-treated LLINs were more effective than pyrethroid-treated LLINs, with adjusted RDs of −2.3 (95% CI −2.7 to −1.9) and −1.5 (95% CI −2.0 to −1.0) comparing 2019 and 2020 high transmission seasons to 2018. Use of IRS sustained protection with adjusted RDs of −1.4 (95% CI −2.0 to −0.9) and −2.8% (95% CI −3.5 to −2.2) relative to pyrethroid-treated LLINs. Overall, 12 of 28 districts (42.9%) experienced increases in malaria risk in from 2018 to 2020.ConclusionLLINs in Malawi have a limited effectiveness lifespan and IRS and PBO-treated LLINs perform better than pyrethroid-treated LLINs, perhaps due to net repurposing and insecticide-resistance. DHIS2 provides a compelling framework in which to examine localised malaria trends and evaluate ongoing interventions.
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Riveron, Jacob M., Silvie Huijben, Williams Tchapga, Magellan Tchouakui, Murielle J. Wondji, Micareme Tchoupo, Helen Irving, et al. "Escalation of Pyrethroid Resistance in the Malaria Vector Anopheles funestus Induces a Loss of Efficacy of Piperonyl Butoxide–Based Insecticide-Treated Nets in Mozambique." Journal of Infectious Diseases 220, no. 3 (March 29, 2019): 467–75. http://dx.doi.org/10.1093/infdis/jiz139.

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Abstract Background Insecticide resistance poses a serious threat to insecticide-based interventions in Africa. There is a fear that resistance escalation could jeopardize malaria control efforts. Monitoring of cases of aggravation of resistance intensity and its impact on the efficacy of control tools is crucial to predict consequences of resistance. Methods The resistance levels of an Anopheles funestus population from Palmeira, southern Mozambique, were characterized and their impact on the efficacy of various insecticide-treated nets established. Results A dramatic loss of efficacy of all long-lasting insecticidal nets (LLINs), including piperonyl butoxide (PBO)–based nets (Olyset Plus), was observed. This An. funestus population consistently (2016, 2017, and 2018) exhibited a high degree of pyrethroid resistance. Molecular analyses revealed that this resistance escalation was associated with a massive overexpression of the duplicated cytochrome P450 genes CYP6P9a and CYP6P9b, and also the fixation of the resistance CYP6P9a_R allele in this population in 2016 (100%) in contrast to 2002 (5%). However, the low recovery of susceptibility after PBO synergist assay suggests that other resistance mechanisms could be involved. Conclusions The loss of efficacy of pyrethroid-based LLINs with and without PBO is a concern for the effectiveness of insecticide-based interventions, and action should be taken to prevent the spread of such super-resistance.
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Bamou, Roland, Edmond Kopya, Leslie Diane Nkahe, Benjamin D. Menze, Parfait Awono-Ambene, Timoléon Tchuinkam, Flobert Njiokou, Charles S. Wondji, and Christophe Antonio-Nkondjio. "Increased prevalence of insecticide resistance in Anopheles coluzzii populations in the city of Yaoundé, Cameroon and influence on pyrethroid-only treated bed net efficacy." Parasite 28 (2021): 8. http://dx.doi.org/10.1051/parasite/2021003.

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In Cameroon, pyrethroid-only long-lasting insecticidal nets (LLINs) are still largely used for malaria control. The present study assessed the efficacy of such LLINs against a multiple-resistant population of the major malaria vector, Anopheles coluzzii, in the city of Yaoundé via a cone bioassay and release-recapture experimental hut trial. Susceptibility of field mosquitoes in Yaoundé to pyrethroids, DDT, carbamates and organophosphate insecticides was investigated using World Health Organization (WHO) bioassay tube tests. Mechanisms of insecticide resistance were characterised molecularly. Efficacy of unwashed PermaNet® 2.0 was evaluated against untreated control nets using a resistant colonised strain of An. coluzzii. Mortality, exophily and blood feeding inhibition were estimated. Field collected An. coluzzii displayed high resistance with mortality rates of 3.5% for propoxur (0.1%), 4.16% for DDT (4%), 26.9% for permethrin (0.75%), 50.8% for deltamethrin (0.05%), and 80% for bendiocarb (0.1%). High frequency of the 1014F west-Africa kdr allele was recorded in addition to the overexpression of several detoxification genes, such as Cyp6P3, Cyp6M2, Cyp9K1, Cyp6P4 Cyp6Z1 and GSTe2. A low mortality rate (23.2%) and high blood feeding inhibition rate (65%) were observed when resistant An. coluzzii were exposed to unwashed PermaNet® 2.0 net compared to control untreated net (p < 0.001). Furthermore, low personal protection (52.4%) was observed with the resistant strain, indicating reduction of efficacy. The study highlights the loss of efficacy of pyrethroid-only nets against mosquitoes exhibiting high insecticide resistance and suggests a switch to new generation bed nets to improve control of malaria vector populations in Yaoundé.
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Dissertations / Theses on the topic "Long lasting insecticidal treated nets (LLINs)"

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Tomayer, Andrew. "Impact of Indoor Residual Spraying and Insecticide-treated Bed Nets on Malaria Transmission in Sub-Saharan Africa Using Mathematical Modelling." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35376.

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Background: Malaria causes over 400,000 estimated deaths annually worldwide, with about 90% in sub-Saharan Africa. Long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS) are two vector-control interventions proven to reduce malaria transmission, but their use together compared to separate has shown mixed results. Methodology: We used a mathematical model to examine the impact of LLINs and IRS on malaria transmission. Time-series analyses and basic reproductive numbers (R0) were developed using MATLAB. We also assessed IRS timing and performed a sensitivity analysis on R0. Results: Modelling scenarios combining LLINs with IRS were similar to those with LLINs alone. Shorter IRS impulses had greater reductions in mosquito populations. The LLIN feeding-inhibition rate was a key parameter with a negative correlation to R0. Discussion/Conclusion: We developed an understanding of the effect of vector-control strategies on malaria transmission. IRS, when paired with LLINs, showed only small improvements in reducing malaria transmission compared to LLINs alone. These results can assist vector-control programmes.
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Bbosa, Richard Serunkuma. "Factors that influence pregnant women’s utilisation of anti-malaria services in the Buikwe district of Uganda." Thesis, 2015. http://hdl.handle.net/10500/20713.

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Malaria is endemic throughout Uganda and the leading cause of morbidity and mortality. Malaria causes complications in 80.0% of all pregnancies in Uganda. This study attempted to identify factors that influence pregnant women’s utilisation of anti-malaria services in the Buikwe district of Uganda. These factors were contextualised within the Social Learning Theory’s major concepts. The target populations comprised pregnant women attending antenatal clinics (phase 1) and midwives providing antenatal services (phase 2) at 16 clinics in the Buikwe district of Uganda during the data collection phase of the study. Structured interviews were conducted with a sample of 400 randomly selected pregnant women and with the accessible population of 40 midwives. Pregnant women, who had progressed beyond primary school level education, were more likely to take intermittent preventive treatment (IPT) drugs and to use long lasting insecticide treated nets (LLINs) to prevent malaria. Pregnant women were more likely to implement malaria-preventive actions if they lived within five kilometres of clinics, were satisfied with available health services, were knowledgeable about the malaria preventive measures and had used IPT during previous pregnancies. Pregnant women who implemented one malaria-preventive action were likely to implement other actions as well (Pearson’s correlation coefficient was 0.65; p<0.05). Midwives’ provision of malaria-preventive services to pregnant women were influenced by the availability of IPT drugs, accessibility of safe drinking water, frequency of giving health education to pregnant women, cooperation with village health teams, malaria-related in-service training, midwives’ education level and experience. Although 97.9% of the pregnant women had taken IPT and 84.2% of those who had received LLINs, utilised these nets, malaria prevention during pregnancy could be improved. All pregnant women should attend antenatal clinics at least four times during each pregnancy, commencing during the first trimester of pregnancy to receive adequate health education and prenatal services, including IPT and LLINs. All midwives should receive malaria-related in-service training. Regular audits of midwives’ records should identify and address strengths and weaknesses related to the prevention and management of malaria during pregnancy. Such actions could enhance the prevention and management of malaria, estimated to affect 80% of pregnant women in Uganda.
Health Studies
D. Litt. et Phil. (Health Studies)
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Books on the topic "Long lasting insecticidal treated nets (LLINs)"

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Rwanda Biomedical Center. Malaria & Other Parasitic Diseases Division. Guidelines for the supply, distribution and management of long lasting insecticide treated nets (LLINs) in Rwanda: Amabwiliza arebana no kohereza inzitiramibu kumavuriro, imicungire yazo, n'uko zitangwa. Kigali: rbc, Rwanda Biomedical Center, Malaria & Other Parasitic Diseases Division, 2010.

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Book chapters on the topic "Long lasting insecticidal treated nets (LLINs)"

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Jr Fouda Abougou, Benjamin. "Finding Novel Strategies to Overcome the Impact of Malaria Vector Resistance in Limited-Resources Settings. The Case of Cameroon as a Basis for Reflection." In Plasmodium Species and Drug Resistance [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98318.

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Malaria remains one of the most important and deadliest diseases in many countries in Africa, in the Americas, in South-East Asia, in the Eastern Mediterranean and in the Western Pacific regions, with high morbidity and mortality, despite important successes for the control of this disease borne by the vector Anopheles mosquitoes. Malaria elimination relies on different strategies including early diagnosis, improved drug therapies and better health infrastructure, and mainly the use of long-lasting insecticidal nets (LLINs) and indoor residual sprayings (IRS) of insecticide. In Cameroon, a country composed of several ethnic groups, malaria transmission is endemic in some regions, while it is seasonal in others; children and pregnant women are most vulnerable. Progress has been made towards malaria control, considering these specificities, and led to a reduction in both morbidity and mortality, but these accomplishments are under threat, mainly due to the development of resistance to insecticides among mosquitoes, targeting the 4 commonly used insecticide classes. To continue our route towards malaria control and elimination, it is urgent to have more knowledge about resistance mechanisms, in the objective of elaborating new strategies with the involvement of the community; these strategies should take into consideration socio-ecological factors such as the young age of the population, low literacy rate especially among women, population’s beliefs, traditions, and customs. Forest ecosystems with abundant rains, humidity and hot temperature, lower access to water for populations living in rural areas, and poverty level are other factors to consider when elaborating malaria control approaches.
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