1
|
Tairou F, Gaye I, Herrera S, Nawaz S, Sarr L, Cissé B, Faye B, Tine RCK. Malaria prevalence and use of control measures in an area with persistent transmission in Senegal. PLoS One 2024; 19:e0303794. [PMID: 38753670 PMCID: PMC11098374 DOI: 10.1371/journal.pone.0303794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 04/30/2024] [Indexed: 05/18/2024] Open
Abstract
INTRODUCTION In Senegal, the widespread use of vector control measures has resulted in a significant reduction in the malaria burden and led the country to consider the possibility of elimination. Given this shift and changing context, it is important to characterize the malaria burden across all age groups to guide decision-making on programmatic interventions to interrupt transmission and ultimately eradicate the disease. In Senegal, there is a lack of information on malaria prevalence among certain populations, particularly among adolescents and adults. This study sought to assess the magnitude of malaria infections in all age groups, as well as malaria associated factors in an area of persistent transmission in Senegal. METHODS A cross-sectional household survey was conducted in four health posts (Khossanto, Mamakhona, Diakhaling and Sambrambougou), of the health district of Saraya, in November 2021, among individuals over 6 months of age. Households were selected using multistage sampling. Consented participants were screened for malaria parasites by microscopic examination of blood smears, and hemoglobin levels were measured using the Hemocue HB 301TM analyzer. Socio-demographic information of the participants, household heads, household assets, and information on ownership and use of preventive measures were collected using a structured questionnaire. Weighted generalized mixed effects logistic regression model was used to identify factors associated with microscopically confirmed malaria infection. RESULTS A total of 1759 participants were enrolled in the study. Overall, about 21% of participants were classified as having Plasmodium infection; children aged 5-10 years old (26.6%), adolescents aged 10-19 years old (24.7%), and children under five years of age (20.5%) had higher rates of infection compared to adults (13.5%). Plasmodium falciparum accounted for 99.2% of the malaria infections, and most infections (69%) were asymptomatic. Around one-third of study participants had anemia (hemoglobin level <11.0 g/dl), with under five children bearing the highest burden (67.3%). Multivariate analysis showed that the odds of having a malaria infection were around 2 times higher among participants in Khossanto compared to Diakhaling (aOR = 1.84, 95% CI:1.06-3.20). Participants aged 5-9 years were more likely to have malaria infection compared to under five children (aOR = 1.40, 95% CI:1.02-1.91). Factors associated with anemia were P. falciparum infection (aOR = 1.36, p = 0.027), females (aOR = 2.16, p = 0.000), under-five age group (aOR = 13.01, p = 0.000). CONCLUSION Malaria burden was considerable among adolescents and under ten children living in an area of persistent transmission, with adolescents more commonly presenting as asymptomatic. Interventions tailored to this specific group of the population are needed to better control the disease and reduce its burden.
Collapse
Affiliation(s)
- Fassiatou Tairou
- Department of Medical Parasitology, University Cheikh Anta Diop of Dakar, Dakar, Senegal
| | - Ibrahima Gaye
- Institut en Santé et Développement, University Cheikh Anta Diop of Dakar, Dakar, Senegal
| | - Samantha Herrera
- Malaria & Neglected Tropical Diseases Division, PATH, Washington, District of Columbia, United States of America
| | - Saira Nawaz
- Primary Health Care, PATH, Seattle, Washington, United States of America
| | - Libasse Sarr
- Department of Geography, University Cheikh Anta Diop of Dakar, Dakar, Senegal
| | - Birane Cissé
- Department of Geography, University Cheikh Anta Diop of Dakar, Dakar, Senegal
| | - Babacar Faye
- Department of Medical Parasitology, University Cheikh Anta Diop of Dakar, Dakar, Senegal
| | - Roger C. K. Tine
- Department of Medical Parasitology, University Cheikh Anta Diop of Dakar, Dakar, Senegal
| |
Collapse
|
2
|
Steinhardt LC, KC A, Tiffany A, Quincer EM, Loerinc L, Laramee N, Large A, Lindblade KA. Reactive Case Detection and Treatment and Reactive Drug Administration for Reducing Malaria Transmission: A Systematic Review and Meta-Analysis. Am J Trop Med Hyg 2024; 110:82-93. [PMID: 38118166 PMCID: PMC10993791 DOI: 10.4269/ajtmh.22-0720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 03/09/2023] [Indexed: 12/22/2023] Open
Abstract
Many countries pursuing malaria elimination implement "reactive" strategies targeting household members and neighbors of index cases to reduce transmission. These strategies include reactive case detection and treatment (RACDT; testing and treating those positive) and reactive drug administration (RDA; providing antimalarials without testing). We conducted systematic reviews of RACDT and RDA to assess their effect on reducing malaria transmission and gathered evidence about key contextual factors important to their implementation. Two reviewers screened titles/abstracts and full-text records using defined criteria (Patient = those in malaria-endemic/receptive areas; Intervention = RACDT or RDA; Comparison = standard of care; Outcome = malaria incidence/prevalence) and abstracted data for meta-analyses. The Grading of Recommendations, Assessment, Development, and Evaluations approach was used to rate certainty of evidence (CoE) for each outcome. Of 1,460 records screened, reviewers identified five RACDT studies (three cluster-randomized controlled trials [cRCTs] and two nonrandomized studies [NRS]) and seven RDA studies (six cRCTs and one NRS); three cRCTs comparing RDA to RACDT were included in both reviews. Compared with RDA, RACDT was associated with nonsignificantly higher parasite prevalence (odds ratio [OR] = 1.85; 95% CI: 0.96-3.57; one study) and malaria incidence (rate ratio [RR] = 1.30; 95% CI: 0.94-1.79; three studies), both very low CoE. Compared with control or RACDT, RDA was associated with non-significantly lower parasite incidence (RR = 0.73; 95% CI: 0.36-1.47; 2 studies, moderate CoE), prevalence (OR = 0.78; 95% CI: 0.52-1.17; 4 studies, low CoE), and malaria incidence (RR = 0.93; 95% CI: 0.82-1.05; six studies, moderate CoE). Evidence for reactive strategies' impact on malaria transmission is limited, especially for RACDT, but suggests RDA might be more effective.
Collapse
Affiliation(s)
- Laura C. Steinhardt
- Malaria Branch, Division of Parasitic Diseases and Malaria, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Achyut KC
- Malaria Branch, Division of Parasitic Diseases and Malaria, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Amanda Tiffany
- Global Malaria Programme, World Health Organization, Geneva, Switzerland
| | | | | | - Nicolas Laramee
- Rollins School of Public Health, Emory University, Atlanta, Georgia
| | - Amy Large
- Rollins School of Public Health, Emory University, Atlanta, Georgia
| | - Kim A. Lindblade
- Malaria Branch, Division of Parasitic Diseases and Malaria, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia
- Global Malaria Programme, World Health Organization, Geneva, Switzerland
| |
Collapse
|
3
|
Orish VN, Kyeremateng C, Appiah BP, Addei IB, Ayaba MA, Kwadzokpui PK, Marinkovic A, Prakash S, Okorie C, Izurieta R, Sanyaolu A. Knowledge and perception of asymptomatic malaria in the Volta region of Ghana. Trans R Soc Trop Med Hyg 2024; 118:33-43. [PMID: 37534813 DOI: 10.1093/trstmh/trad049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 06/19/2023] [Accepted: 07/17/2023] [Indexed: 08/04/2023] Open
Abstract
BACKGROUND The control of asymptomatic malaria is considered a key aspect of malaria control. This study aimed to assess the knowledge and perception of asymptomatic malaria among people in Ho municipality of the Volta region. METHODS A descriptive cross-sectional study involving questionnaire administration was conducted among randomly sampled residents of the Ho municipality of the Volta region of Ghana. Using SPSS version 25 statistical software, frequency distributions and proportions were computed for sociodemographic variables while knowledge and perception about asymptomatic malaria were computed into percentages and categorized into three levels based on Bloom's cut-off for further analysis. Findings with p-values <0.05 were considered statistically significant. RESULTS Among the 200 participants, 197 (98.5%) were aware of malaria. The majority (116 [58.0%]) of the study participants agreed to the possibility of asymptomatic infection, but most (133 [66.5%]) of the community members did not know that asymptomatic individuals can still transmit infections. The majority of the participants (184 [92.0%]) showed interest in getting further education on asymptomatic malaria and a significant majority (180 [90.0%]) expressed a willingness to take treatment after testing positive without showing any symptoms. CONCLUSIONS Asymptomatic malaria control can be achieved through a mass testing and treatment strategy, therefore improving the knowledge and perception about asymptomatic malaria might improve malaria control.
Collapse
Affiliation(s)
- Verner N Orish
- Department of Microbiology and Immunology, School of Medicine, University of Health and Allied Sciences, Ho, Volta Region, Ghana
| | - Caleb Kyeremateng
- School of Medicine, University of Health and Allied Sciences, Ho, Ghana
| | - Baffoe P Appiah
- Department of Medical Laboratory Sciences, School of Allied Health Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - Isaac B Addei
- School of Medicine, University of Health and Allied Sciences, Ho, Ghana
| | - Moses A Ayaba
- School of Medicine, University of Health and Allied Sciences, Ho, Ghana
| | | | | | | | - Chuku Okorie
- Department of Allied Health Sciences, Union College of Union County, Plainfield Campus, NJ, USA
| | - Ricardo Izurieta
- Department of Global Communicable Diseases, College of Public Health, University of South Florida, Tampa, FL, USA
| | - Adekunle Sanyaolu
- Department of Public Health, Federal Ministry of Health, Abuja, Nigeria
| |
Collapse
|
4
|
Sabaly P, Ngom EHM, Gueye NA, Gueye A, Diallo M, Dia I. Differential insecticide resistance in Anopheles arabiensis populations in the seaside area of Mbour and its suburbs in Senegal. Heliyon 2023; 9:e21968. [PMID: 38027803 PMCID: PMC10658326 DOI: 10.1016/j.heliyon.2023.e21968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 09/18/2023] [Accepted: 11/01/2023] [Indexed: 12/01/2023] Open
Abstract
Regular monitoring of insecticide resistance status is an important step in implementing appropriate and adapted insecticide-based strategies for vector control. In Senegal, Indoor Residual Spraying (IRS) and a national distribution campaign for long-lasting insecticide-treated net (LLIN) have been implemented since 2007 and 2009, respectively to prevent malaria transmission. To expand and ensure the sustainability of these strategies, we conducted a study on the status of insecticide resistance in malaria vectors in the seaside area of Mbour and its suburbs where no data were previously available. Anopheles larvae were sampled from four study sites (two in both coastal and inland areas) and reared to adulthood in the insectarium. Non-blood-fed females aged 3-5 days were then tested for susceptibility to permethrin, deltamethrin, lambdacyhalothrin, bendiocarb and pirimiphos-methyl. PCR amplification was used to identify sibling species of the An. gambiae complex and genotyping for the presence of resistance knockdown (kdr) L1014S, L1014F and Ace-1 G119S. Anopheles arabiensis was the only species present in the area. At all four sites, mosquitoes were resistant to deltamethrin, permethrin, and lambdacyhalothrin, and exhibited varying degrees of resistance to bendiocarb and pirimiphos-methyl. Overall, high levels of leucine-serine/phenylalanine substitutions at position 1014 (L1014S/L1014F) were observed, with frequencies ranging from 76.4 to 85.2 % for L1014F, and from 43.2 to 66.7 % for L1014S, compared to 8.1 to 28.3 for the Ace-1 G119S mutation. These results indicate a high level of phenotypic and genotypic resistance to insecticides, which is alarming, as it could have a significant impact on the operational effectiveness of current vector control tools that rely on pyrethroids. However, in the case of bendiocarb and pirimiphos-methyl, while some level of tolerance was observed, their potential use requires regular monitoring to prevent operational failure, as their deployment could potentially lead to an increase in resistance to them.
Collapse
Affiliation(s)
- Penda Sabaly
- Pole de Zoologie Médicale, Institut Pasteur de Dakar, 36 Avenue Pasteur, BP, 220, Dakar, Senegal
| | - El Hadji Malick Ngom
- Pole de Zoologie Médicale, Institut Pasteur de Dakar, 36 Avenue Pasteur, BP, 220, Dakar, Senegal
| | - Ndeye Astou Gueye
- Pole de Zoologie Médicale, Institut Pasteur de Dakar, 36 Avenue Pasteur, BP, 220, Dakar, Senegal
| | - Assiyatou Gueye
- Pole de Zoologie Médicale, Institut Pasteur de Dakar, 36 Avenue Pasteur, BP, 220, Dakar, Senegal
| | - Mawlouth Diallo
- Pole de Zoologie Médicale, Institut Pasteur de Dakar, 36 Avenue Pasteur, BP, 220, Dakar, Senegal
| | - Ibrahima Dia
- Pole de Zoologie Médicale, Institut Pasteur de Dakar, 36 Avenue Pasteur, BP, 220, Dakar, Senegal
| |
Collapse
|
5
|
Newby G, Cotter C, Roh ME, Harvard K, Bennett A, Hwang J, Chitnis N, Fine S, Stresman G, Chen I, Gosling R, Hsiang MS. Testing and treatment for malaria elimination: a systematic review. Malar J 2023; 22:254. [PMID: 37661286 PMCID: PMC10476355 DOI: 10.1186/s12936-023-04670-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 08/07/2023] [Indexed: 09/05/2023] Open
Abstract
BACKGROUND Global interest in malaria elimination has prompted research on active test and treat (TaT) strategies. METHODS A systematic review and meta-analysis were conducted to assess the effectiveness of TaT strategies to reduce malaria transmission. RESULTS A total of 72 empirical research and 24 modelling studies were identified, mainly focused on proactive mass TaT (MTaT) and reactive case detection (RACD) in higher and lower transmission settings, respectively. Ten intervention studies compared MTaT to no MTaT and the evidence for impact on malaria incidence was weak. No intervention studies compared RACD to no RACD. Compared to passive case detection (PCD) alone, PCD + RACD using standard diagnostics increased infection detection 52.7% and 11.3% in low and very low transmission settings, respectively. Using molecular methods increased this detection of infections by 1.4- and 1.1-fold, respectively. CONCLUSION Results suggest MTaT is not effective for reducing transmission. By increasing case detection, surveillance data provided by RACD may indirectly reduce transmission by informing coordinated responses of intervention targeting.
Collapse
Affiliation(s)
- Gretchen Newby
- Malaria Elimination Initiative, Institute for Global Health Sciences, University of California San Francisco (UCSF), 550 16th Street, San Francisco, CA, 94143, USA
| | - Chris Cotter
- Malaria Elimination Initiative, Institute for Global Health Sciences, University of California San Francisco (UCSF), 550 16th Street, San Francisco, CA, 94143, USA
- Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden
| | - Michelle E Roh
- Malaria Elimination Initiative, Institute for Global Health Sciences, University of California San Francisco (UCSF), 550 16th Street, San Francisco, CA, 94143, USA
- Department of Epidemiology and Biostatistics, UCSF, San Francisco, CA, USA
| | - Kelly Harvard
- Malaria Elimination Initiative, Institute for Global Health Sciences, University of California San Francisco (UCSF), 550 16th Street, San Francisco, CA, 94143, USA
| | - Adam Bennett
- Malaria Elimination Initiative, Institute for Global Health Sciences, University of California San Francisco (UCSF), 550 16th Street, San Francisco, CA, 94143, USA
- Department of Epidemiology and Biostatistics, UCSF, San Francisco, CA, USA
- PATH, Seattle, WA, USA
| | - Jimee Hwang
- Malaria Branch, Centers for Disease Control and Prevention, U.S. President's Malaria Initiative, Atlanta, GA, USA
| | - Nakul Chitnis
- Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Allschwil, Switzerland
- University of Basel, Basel, Switzerland
| | - Sydney Fine
- Malaria Elimination Initiative, Institute for Global Health Sciences, University of California San Francisco (UCSF), 550 16th Street, San Francisco, CA, 94143, USA
| | - Gillian Stresman
- College of Public Health, University of South Florida, Tampa, FL, USA
- Department of Infection Biology, London School of Hygiene & Tropical Medicine, London, UK
| | - Ingrid Chen
- Malaria Elimination Initiative, Institute for Global Health Sciences, University of California San Francisco (UCSF), 550 16th Street, San Francisco, CA, 94143, USA
- Department of Epidemiology and Biostatistics, UCSF, San Francisco, CA, USA
| | - Roly Gosling
- Malaria Elimination Initiative, Institute for Global Health Sciences, University of California San Francisco (UCSF), 550 16th Street, San Francisco, CA, 94143, USA
- Department of Epidemiology and Biostatistics, UCSF, San Francisco, CA, USA
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London, UK
| | - Michelle S Hsiang
- Malaria Elimination Initiative, Institute for Global Health Sciences, University of California San Francisco (UCSF), 550 16th Street, San Francisco, CA, 94143, USA.
- Department of Epidemiology and Biostatistics, UCSF, San Francisco, CA, USA.
- Department of Pediatrics, UCSF, San Francisco, CA, USA.
| |
Collapse
|
6
|
Aidoo EK, Aboagye FT, Botchway FA, Osei-Adjei G, Appiah M, Duku-Takyi R, Sakyi SA, Amoah L, Badu K, Asmah RH, Lawson BW, Krogfelt KA. Reactive Case Detection Strategy for Malaria Control and Elimination: A 12 Year Systematic Review and Meta-Analysis from 25 Malaria-Endemic Countries. Trop Med Infect Dis 2023; 8:tropicalmed8030180. [PMID: 36977181 PMCID: PMC10058581 DOI: 10.3390/tropicalmed8030180] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/23/2023] [Accepted: 03/09/2023] [Indexed: 03/30/2023] Open
Abstract
Reactive case detection (RACD) is the screening of household members and neighbors of index cases reported in passive surveillance. This strategy seeks asymptomatic infections and provides treatment to break transmission without testing or treating the entire population. This review discusses and highlights RACD as a recommended strategy for the detection and elimination of asymptomatic malaria as it pertains in different countries. Relevant studies published between January 2010 and September 2022 were identified mainly through PubMed and Google Scholar. Search terms included "malaria and reactive case detection", "contact tracing", "focal screening", "case investigation", "focal screen and treat". MedCalc Software was used for data analysis, and the findings from the pooled studies were analyzed using a fixed-effect model. Summary outcomes were then presented using forest plots and tables. Fifty-four (54) studies were systematically reviewed. Of these studies, 7 met the eligibility criteria based on risk of malaria infection in individuals living with an index case < 5 years old, 13 met the eligibility criteria based on risk of malaria infection in an index case household member compared with a neighbor of an index case, and 29 met the eligibility criteria based on risk of malaria infection in individuals living with index cases, and were included in the meta-analysis. Individuals living in index case households with an average risk of 2.576 (2.540-2.612) were more at risk of malaria infection and showed pooled results of high variation heterogeneity chi-square = 235.600, (p < 0.0001) I2 = 98.88 [97.87-99.89]. The pooled results showed that neighbors of index cases were 0.352 [0.301-0.412] times more likely to have a malaria infection relative to index case household members, and this result was statistically significant (p < 0.001). The identification and treatment of infectious reservoirs is critical to successful malaria elimination. Evidence to support the clustering of infections in neighborhoods, which necessitates the inclusion of neighboring households as part of the RACD strategy, was presented in this review.
Collapse
Affiliation(s)
- Ebenezer Krampah Aidoo
- Department of Medical Laboratory Technology, Accra Technical University, Accra GP 561, Ghana
| | - Frank Twum Aboagye
- Biomedical and Public Health Research Unit, Council for Scientific and Industrial Research-Water Research Institute, Accra AH 38, Ghana
| | - Felix Abekah Botchway
- Department of Medical Laboratory Technology, Accra Technical University, Accra GP 561, Ghana
| | - George Osei-Adjei
- Department of Medical Laboratory Technology, Accra Technical University, Accra GP 561, Ghana
| | - Michael Appiah
- Department of Medical Laboratory Technology, Accra Technical University, Accra GP 561, Ghana
| | - Ruth Duku-Takyi
- Department of Medical Laboratory Technology, Accra Technical University, Accra GP 561, Ghana
| | - Samuel Asamoah Sakyi
- Department of Molecular Medicine, Kwame Nkrumah University of Science & Technology, University Post Office, Kumasi AK 039, Ghana
| | - Linda Amoah
- Department of Immunology, Noguchi Memorial Institute for Medical Research, University of Ghana, Accra LG 581, Ghana
| | - Kingsley Badu
- Department of Theoretical & Applied Biology, Kwame Nkrumah University of Science & Technology, University Post Office, Kumasi AK 039, Ghana
| | - Richard Harry Asmah
- Department of Biomedical Sciences, School of Basic and Biomedical Science, University of Health & Allied Sciences, Ho PMB 31, Ghana
| | - Bernard Walter Lawson
- Department of Theoretical & Applied Biology, Kwame Nkrumah University of Science & Technology, University Post Office, Kumasi AK 039, Ghana
| | - Karen Angeliki Krogfelt
- Department of Science and Environment, Unit of Molecular and Medical Biology, The PandemiX Center, Roskilde University, 4000 Roskilde, Denmark
- Department of Virus and Microbiological Special Diagnostics, Statens Serum Institut, 2300 Copenhagen, Denmark
| |
Collapse
|
7
|
Oduma CO, Ombok M, Zhao X, Huwe T, Ondigo BN, Kazura JW, Grieco J, Achee N, Liu F, Ochomo E, Koepfli C. Altitude, not potential larval habitat availability, explains pronounced variation in Plasmodium falciparum infection prevalence in the western Kenya highlands. PLOS GLOBAL PUBLIC HEALTH 2023; 3:e0001505. [PMID: 37068071 PMCID: PMC10109483 DOI: 10.1371/journal.pgph.0001505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 03/03/2023] [Indexed: 04/18/2023]
Abstract
Progress in malaria control has stalled over the recent years. Knowledge on main drivers of transmission explaining small-scale variation in prevalence can inform targeted control measures. We collected finger-prick blood samples from 3061 individuals irrespective of clinical symptoms in 20 clusters in Busia in western Kenya and screened for Plasmodium falciparum parasites using qPCR and microscopy. Clusters spanned an altitude range of 207 meters (1077-1284 m). We mapped potential mosquito larval habitats and determined their number within 250 m of a household and distances to households using ArcMap. Across all clusters, P. falciparum parasites were detected in 49.8% (1524/3061) of individuals by qPCR and 19.5% (596/3061) by microscopy. Across the clusters, prevalence ranged from 26% to 70% by qPCR. Three to 34 larval habitats per cluster and 0-17 habitats within a 250m radius around households were observed. Using a generalized linear mixed effect model (GLMM), a 5% decrease in the odds of getting infected per each 10m increase in altitude was observed, while the number of larval habitats and their proximity to households were not statistically significant predictors for prevalence. Kitchen located indoors, open eaves, a lower level of education of the household head, older age, and being male were significantly associated with higher prevalence. Pronounced variation in prevalence at small scales was observed and needs to be taken into account for malaria surveillance and control. Potential larval habitat frequency had no direct impact on prevalence.
Collapse
Affiliation(s)
- Colins O Oduma
- Department of Biochemistry and Molecular Biology, Egerton University, Nakuru, Kenya
- Kenya Medical Research Institute, Centre for Global Health Research, Kisumu, Kenya
| | - Maurice Ombok
- Kenya Medical Research Institute, Centre for Global Health Research, Kisumu, Kenya
| | - Xingyuan Zhao
- Department of Applied and Computational Mathematics and Statistics, University of Notre Dame, Notre Dame, IN, United States of America
| | - Tiffany Huwe
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States of America
| | - Bartholomew N Ondigo
- Department of Biochemistry and Molecular Biology, Egerton University, Nakuru, Kenya
- Kenya Medical Research Institute, Centre for Global Health Research, Kisumu, Kenya
| | - James W Kazura
- Case Western Reserve University, Center for Global Health and Diseases, Cleveland, OH, United States of America
| | - John Grieco
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States of America
| | - Nicole Achee
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States of America
| | - Fang Liu
- Department of Applied and Computational Mathematics and Statistics, University of Notre Dame, Notre Dame, IN, United States of America
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States of America
| | - Eric Ochomo
- Kenya Medical Research Institute, Centre for Global Health Research, Kisumu, Kenya
| | - Cristian Koepfli
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States of America
| |
Collapse
|
8
|
Singh A, Rajvanshi H, Singh MP, Bhandari S, Nisar S, Poriya R, Telasey V, Jayswar H, Mishra AK, Das A, Kaur H, Lal AA, Bharti PK. Mass screening and treatment (MSaT) for identifying and treating asymptomatic cases of malaria-malaria elimination demonstration project (MEDP), Mandla, Madhya Pradesh. Malar J 2022; 21:395. [PMID: 36575544 PMCID: PMC9793628 DOI: 10.1186/s12936-022-04423-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 12/19/2022] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Mass screening and treatment (MSaT) aims at reducing the spread of malaria in communities by identifying and treating infected persons regardless of the symptoms. This study was conducted to identify and treat asymptomatic cases using MSaT approaches in the community. METHODS Three rounds of MSaT using cluster combination approaches were carried out during September 2018 to December 2019 to identify and treat asymptomatic malaria cases in the community. All individuals who were present in the household were screened using RDT irrespective of malaria related symptoms. Simultaneously thick and thin blood smear and blood spot were collected for further analysis using microscopy and diagnostic PCR done in a subset of the samples. RESULTS Logistic regression analysis revealed that asymptomatic malaria cases significantly less among the older age groups compared with < 5 years children (OR ranged between 0.52 and 0.61; p < 0.05), lowest in cluster 4 (OR = 0.01; p < 0.0001); during third round of MSaT survey (OR = 0.11; p < 0.0001) and significantly higher in moderate to high endemic areas (OR = 88.30; p < 0.0001). CONCLUSION Over the three rounds of MSaT, the number of asymptomatic cases were significantly less in the older age groups, and during third round. Similarly, the asymptomatic cases were significantly less in the low endemic area with API < 1 (cluster four). Therefore, the malaria elimination programme may consider the MSaT strategy to identify asymptomatic cases that would be otherwise missed by routine fever based surveillance. This MSaT strategy would help accomplish the malaria elimination goal in an expedited manner.
Collapse
Affiliation(s)
- Akansha Singh
- grid.452686.b0000 0004 1767 2217Indian Council of Medical Research - National Institute of Research in Tribal Health (ICMR-NIRTH), Jabalpur, Madhya Pradesh India ,grid.419641.f0000 0000 9285 6594Indian Council of Medical Research - National Institute of Malaria Research (ICMR-NIMR), New Delhi, India
| | - Harsh Rajvanshi
- Malaria Elimination Demonstration Project, Mandla, Madhya Pradesh India ,Present Address: Asia Pacific Leaders Malaria Alliance (APLMA), Singapore, Singapore
| | | | - Sneha Bhandari
- grid.19096.370000 0004 1767 225XIndian Council of Medical Research - National Institute of Research in Environment Health (ICMR-NIREH), Bhopal, Madhya Pradesh India
| | - Sekh Nisar
- Malaria Elimination Demonstration Project, Mandla, Madhya Pradesh India ,Present Address: Department of Health and Family Welfare, NHM Raigarh, Raigarh, Chattisgarh India
| | - Rajan Poriya
- grid.452686.b0000 0004 1767 2217Indian Council of Medical Research - National Institute of Research in Tribal Health (ICMR-NIRTH), Jabalpur, Madhya Pradesh India
| | - Vinay Telasey
- Malaria Elimination Demonstration Project, Mandla, Madhya Pradesh India
| | - Himanshu Jayswar
- Directorate of Health Services, Government of Madhya Pradesh, Bhopal, India
| | - Ashok K. Mishra
- grid.452686.b0000 0004 1767 2217Indian Council of Medical Research - National Institute of Research in Tribal Health (ICMR-NIRTH), Jabalpur, Madhya Pradesh India
| | - Aparup Das
- grid.452686.b0000 0004 1767 2217Indian Council of Medical Research - National Institute of Research in Tribal Health (ICMR-NIRTH), Jabalpur, Madhya Pradesh India
| | - Harpreet Kaur
- grid.19096.370000 0004 1767 225XDepartment of Health Research, Ministry of Health and Family Welfare, Indian Council of Medical Research, New Delhi, India
| | - Altaf A. Lal
- Malaria Elimination Demonstration Project, Mandla, Madhya Pradesh India ,Foundation for Disease Elimination and Control of India, Mumbai, 482003 Maharashtra India
| | - Praveen K. Bharti
- grid.452686.b0000 0004 1767 2217Indian Council of Medical Research - National Institute of Research in Tribal Health (ICMR-NIRTH), Jabalpur, Madhya Pradesh India ,grid.419641.f0000 0000 9285 6594Indian Council of Medical Research - National Institute of Malaria Research (ICMR-NIMR), New Delhi, India
| |
Collapse
|
9
|
Evaluation of the Efficacy of Fludora® Fusion WP-SB 56.25 (Mixture of Clothianidin and Deltamethrin) against Anopheles coluzzii Laboratory and An. arabiensis Wild Colonies. Trop Med Infect Dis 2022; 7:tropicalmed7100316. [PMID: 36288057 PMCID: PMC9610818 DOI: 10.3390/tropicalmed7100316] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 10/10/2022] [Accepted: 10/15/2022] [Indexed: 11/16/2022] Open
Abstract
For malaria control, the application of long-lasting insecticidal nets and indoor residual spraying has led to a significant reduction in morbidity and mortality. However, the sustainability of these gains is hampered by the increase in insecticide resistance. It is therefore judicious to evaluate new insecticide formulations. In comparison to clothianidin and deltamethrin, the efficacy and residual effect of Fludora® Fusion was evaluated using an Anopheles coluzzii laboratory and An. arabiensis wild colonies in huts from August 2016 to June 2017 on cement and mud walls. Mortality was recorded at 24, 48, 72, and 96 h post exposure. Like deltamethrin and clothianidin, Fludora® Fusion showed delayed mortality rates above the WHO’s 80% threshold over a period of 11 months with the laboratory strain. With the wild strain, while residual efficacy was observed at 2 months for the three insecticides, no residual efficacy was observed at 8 months at 24 h in both substrates. However, the increased efficacy was observed with increased holding periods (72 h and 96 h). These findings suggest that Fludora® Fusion could be an alternative candidate since this duration covers the transmission period in most areas in Senegal.
Collapse
|
10
|
Raslan E, AbdAllah M, Soliman S. The prevalence and determinants of hepatitis B among Egyptian adults: a further analysis of a country-representative survey. EGYPTIAN LIVER JOURNAL 2022. [DOI: 10.1186/s43066-022-00207-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Hepatitis B virus (HBV) infection is a major worldwide healthcare problem with subsequent serious complications including cirrhosis and hepatocellular carcinoma (HCC). Hence, taking cognizance of HBV impact is critical for future planning of its control and prevention.
Objectives
To assess the prevalence of HBV in Egypt, analyse the demographic characteristics of HBV-infected patients and examine the common routes of its transmission.
Methods
This is a cross-sectional study of data from the Egyptian Health Issues Survey (EHIS), which employed a nationally representative sample of 16,004 individuals. The survey participants were categorized into two groups: group A, HBV positive, and group B, HBV negative. Comparative analysis was performed to identify demographic features and define possible risk factors.
Results
The total number of participants included in the study was 16,004. The mean age (± SD) was 33.5 (± 12.4) years. The prevalence of HBV was 1.52%. Demographic analysis showed that HBV was more prevalent among males, married people, people with jobs and smokers (P = 0.0011, 0.002, < 0.001 and 0.0036) respectively. Employing an adjusted multivariate logistic regression model, we observed an increased likelihood of HBV infection in married adults who received cupping without blood and who did not know if they had schistosomiasis injection therapy.
Conclusion
The application of special screening programs to highly susceptible patients and treatment optimization is recommended for the elimination of HBV. EHIS indicates the likely success of the previous Egyptian control plan for viral hepatitis through reducing several risk factors.
Collapse
|
11
|
Niang M, Sandfort M, Mbodj AF, Diouf B, Talla C, Faye J, Sane R, Thiam LG, Thiam A, Badiane A, Vigan-Womas I, Diagne N, Diene Sarr F, Mueller I, Sokhna C, White M, Toure-Balde A. Fine-scale Spatiotemporal Mapping of Asymptomatic and Clinical Plasmodium falciparum Infections: Epidemiological Evidence for Targeted Malaria Elimination Interventions. Clin Infect Dis 2021; 73:2175-2183. [PMID: 33677477 DOI: 10.1093/cid/ciab161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND A detailed understanding of the contribution of the asymptomatic Plasmodium reservoir to the occurrence of clinical malaria at individual and community levels is needed to guide effective elimination interventions. This study investigated the relationship between asymptomatic Plasmodium falciparum carriage and subsequent clinical malaria episodes in the Dielmo and Ndiop villages in Senegal. METHODS The study used a total of 2792 venous and capillary blood samples obtained from asymptomatic individuals and clinical malaria datasets collected from 2013 to 2016. Mapping, spatial clustering of infections, and risk analysis were performed using georeferenced households. RESULTS High incidences of clinical malaria episodes were observed to occur predominantly in households of asymptomatic P falciparum carriers. A statistically significant association was found between asymptomatic carriage in a household and subsequent episode of clinical malaria occurring in that household for each individual year (P values were 0.0017, 6 × 10-5, 0.005, and 0.008 for the years 2013, 2014, 2015, and 2016 respectively) and the combined years (P = 8.5 × 10-8), which was not found at the individual level. In both villages, no significant patterns of spatial clustering of P falciparum clinical cases were found, but there was a higher risk of clinical episodes <25 m from asymptomatic individuals in Ndiop attributable to clustering within households. CONCLUSION The findings provide strong epidemiological evidence linking the asymptomatic P falciparum reservoir to clinical malaria episodes at household scale in Dielmo and Ndiop villagers. This argues for a likely success of a mass testing and treatment intervention to move towards the elimination of malaria in the villages of Dielmo and Ndiop.
Collapse
Affiliation(s)
- Makhtar Niang
- Institut Pasteur Dakar, Pôle Immunophysiopathologie & Maladies Infectieuses, Dakar, Sénégal
| | - Mirco Sandfort
- Malaria: Parasites and Hosts Unit, Department of Parasites & Insect Vectors, Institut Pasteur, Paris, France.,Sorbonne Université, Collège doctoral, Paris, France
| | - Adja Fatou Mbodj
- Institut Pasteur Dakar, Pôle Immunophysiopathologie & Maladies Infectieuses, Dakar, Sénégal
| | - Babacar Diouf
- Institut Pasteur Dakar, Pôle Immunophysiopathologie & Maladies Infectieuses, Dakar, Sénégal
| | - Cheikh Talla
- Institut Pasteur Dakar, Pôle Epidémiologie, Recherche Clinique et Science des données, Dakar, Sénégal
| | - Joseph Faye
- Institut Pasteur Dakar, Pôle Epidémiologie, Recherche Clinique et Science des données, Dakar, Sénégal
| | - Rokhaya Sane
- Institut Pasteur Dakar, Pôle Immunophysiopathologie & Maladies Infectieuses, Dakar, Sénégal
| | - Laty Gaye Thiam
- Institut Pasteur Dakar, Pôle Immunophysiopathologie & Maladies Infectieuses, Dakar, Sénégal
| | - Alassane Thiam
- Institut Pasteur Dakar, Pôle Immunophysiopathologie & Maladies Infectieuses, Dakar, Sénégal
| | - Abdoulaye Badiane
- Institut Pasteur Dakar, Pôle Epidémiologie, Recherche Clinique et Science des données, Dakar, Sénégal
| | - Ines Vigan-Womas
- Institut Pasteur Dakar, Pôle Immunophysiopathologie & Maladies Infectieuses, Dakar, Sénégal
| | | | - Fatoumata Diene Sarr
- Institut Pasteur Dakar, Pôle Epidémiologie, Recherche Clinique et Science des données, Dakar, Sénégal
| | - Ivo Mueller
- Malaria: Parasites and Hosts Unit, Department of Parasites & Insect Vectors, Institut Pasteur, Paris, France
| | - Cheikh Sokhna
- VITROME, Campus international IRD-UCAD, Dakar, Sénégal
| | - Michael White
- Malaria: Parasites and Hosts Unit, Department of Parasites & Insect Vectors, Institut Pasteur, Paris, France
| | - Aissatou Toure-Balde
- Institut Pasteur Dakar, Pôle Immunophysiopathologie & Maladies Infectieuses, Dakar, Sénégal
| |
Collapse
|
12
|
Conner RO, Dieye Y, Hainsworth M, Tall A, Cissé B, Faye F, Sy MD, Ba A, Sene D, Ba S, Doucouré E, Thiam T, Diop M, Schneider K, Cissé M, Ba M, Scott CA, Kumar R, Asfaw E, Earle D, Guinot P, Steketee RW, Guinovart C. Correction to: Mass testing and treatment for malaria followed by weekly fever screening, testing and treatment in Northern Senegal: feasibility, cost and impact. Malar J 2020; 19:443. [PMID: 33256751 PMCID: PMC7706200 DOI: 10.1186/s12936-020-03484-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Affiliation(s)
- Ruben O Conner
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Yakou Dieye
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Michael Hainsworth
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Adama Tall
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Badara Cissé
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Farba Faye
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Mame Demba Sy
- Programme National de Lutte contre le Paludisme (PNLP), Ministère de la Santé et l'Action Sociale, Dakar, Senegal
| | - Amadou Ba
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Doudou Sene
- Programme National de Lutte contre le Paludisme (PNLP), Ministère de la Santé et l'Action Sociale, Dakar, Senegal
| | - Souleymane Ba
- Programme National de Lutte contre le Paludisme (PNLP), Ministère de la Santé et l'Action Sociale, Dakar, Senegal
| | - Elhadji Doucouré
- Programme National de Lutte contre le Paludisme (PNLP), Ministère de la Santé et l'Action Sociale, Dakar, Senegal
| | - Tidiane Thiam
- Programme National de Lutte contre le Paludisme (PNLP), Ministère de la Santé et l'Action Sociale, Dakar, Senegal
| | - Moussa Diop
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Kammerle Schneider
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Moustapha Cissé
- Programme National de Lutte contre le Paludisme (PNLP), Ministère de la Santé et l'Action Sociale, Dakar, Senegal
| | - Mady Ba
- Programme National de Lutte contre le Paludisme (PNLP), Ministère de la Santé et l'Action Sociale, Dakar, Senegal
| | - Callie A Scott
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Ritu Kumar
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Elias Asfaw
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Duncan Earle
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Philippe Guinot
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Richard W Steketee
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA
| | - Caterina Guinovart
- PATH Malaria Control and Elimination Partnership in Africa (MACEPA), 2201 Westlake Avenue, Suite 200, Seattle, WA, 98121, USA. .,Barcelona Institute for Global Health (ISGlobal), Hospital Clínic-Universitat de Barcelona, Rosselló 132, 08036, Barcelona, Spain.
| |
Collapse
|