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  1. Article ; Online: Randomized Field Trial to Assess the Safety and Efficacy of Dihydroartemisinin-Piperaquine for Seasonal Malaria Chemoprevention in School-Aged Children in Bandiagara, Mali.

    Traore, Karim / Coulibaly, Drissa / Kone, Abdoulaye K / Guindo, Boureima / Traore, Souleymane / Kouriba, Kindie / Djimde, Moussa / Thera, Mahamadou Ali

    The Journal of infectious diseases

    2024  Volume 229, Issue 1, Page(s) 189–197

    Abstract: Background: Owing to the increased cases of malaria in older children, the World Health Organization has recently recommended extending seasonal malaria chemoprevention (SMC) to children >5 years of age and using other effective drugs for malaria. In ... ...

    Abstract Background: Owing to the increased cases of malaria in older children, the World Health Organization has recently recommended extending seasonal malaria chemoprevention (SMC) to children >5 years of age and using other effective drugs for malaria. In this study, we report the safety and efficacy of dihydroartemisinin-piperaquine (DHA-PQ) for SMC in school-aged children in Mali.
    Method: This randomized, controlled trial included 345 participants aged 6-15 years randomized to receive DHA-PQ, sulfadoxine-pyrimethamine plus amodiaquine (SP-AQ), or no chemoprevention (albendazole) at a 1:1:1 ratio. Four rounds of SMC were conducted from September to December 2021. The participants were assessed 7 days after each round for safety and efficacy of the interventions.
    Results: Abdominal pain (11.8% vs 29.2%), headache (11.2% vs 19.2%), and vomiting (5.7% vs 15.2%) were frequently reported in the DHA-PQ and SP-AQ arms. On Day 120 of follow up, the incidence of clinical malaria was 0.01 episodes/person-month in the DHA-PQ and SP-AQ arms and 0.17 episodes/person-month in the control arm (P < .0001). Gametocytes were detected in 37 participants in all arms.
    Conclusions: Children in DHA-PQ arm reported less adverse events compared to the SP-AQ arm. Both drugs were effective against clinical malaria and infection.
    MeSH term(s) Child ; Humans ; Infant ; Child, Preschool ; Antimalarials/adverse effects ; Mali/epidemiology ; Seasons ; Malaria/epidemiology ; Sulfadoxine/adverse effects ; Amodiaquine/adverse effects ; Drug Combinations ; Chemoprevention/adverse effects ; Piperazines ; Quinolines ; Artemisinins
    Chemical Substances artenimol (6A9O50735X) ; Antimalarials ; piperaquine (A0HV2Q956Y) ; Sulfadoxine (88463U4SM5) ; Amodiaquine (220236ED28) ; Drug Combinations ; Piperazines ; Quinolines ; Artemisinins
    Language English
    Publishing date 2024-01-15
    Publishing country United States
    Document type Randomized Controlled Trial ; Journal Article
    ZDB-ID 3019-3
    ISSN 1537-6613 ; 0022-1899
    ISSN (online) 1537-6613
    ISSN 0022-1899
    DOI 10.1093/infdis/jiad387
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Nanoparticle tracking analysis of natural hemozoin from Plasmodium parasites.

    Omorou, Roukayatou / Delabie, Blanche / Lavoignat, Adeline / Chaker, Victorien / Bonnot, Guillaume / Traore, Karim / Bienvenu, Anne-Lise / Picot, Stephane

    Acta tropica

    2023  Volume 250, Page(s) 107105

    Abstract: Background: Hemozoin is a byproduct of hemoglobin digestion crucial for parasite survival. It forms crystals that can be of interest as drug targets or biomarkers of malaria infection. However, hemozoin has long been considered as an amorphous crystal ... ...

    Abstract Background: Hemozoin is a byproduct of hemoglobin digestion crucial for parasite survival. It forms crystals that can be of interest as drug targets or biomarkers of malaria infection. However, hemozoin has long been considered as an amorphous crystal of simple morphology. Studying the consequences of biomineralization of this crystal during the parasite growth may provide more comprehensive evidence of its role during malaria.
    Objectives: This study aimed to investigate the interest of nanoparticles tracker analysis for measuring the concentration and size of hemozoin particles produced from different parasite sources and conditions.
    Methods: Hemozoin was extracted from several clones of Plasmodium falciparum both asexual and sexual parasites. Hemozoin was also extracted from blood samples of malaria patients and from saliva of asymptomatic malaria carriers. Nanoparticles tracking analysis (NTA) was performed to assess the size and concentration of hemozoin.
    Results: NTA data showed variation in hemozoin concentration, size, and crystal clusters between parasite clones, species, and stages. Among parasite clones, hemozoin concentration ranged from 131 to 2663 particles/infected red blood cell (iRBC) and size ranged from 149.6 ± 6.3 nm to 234.8 ± 40.1 nm. The mean size was lower for Plasmodium vivax (176 ± 79.2 nm) than for Plasmodium falciparum (254.8 ± 74.0 nm). Sexual NF54 parasites showed a 7.5-fold higher concentration of hemozoin particles (28.7 particles/iRBC) compared to asexual parasites (3.8 particles/iRBC). In addition, the mean hemozoin size also increased by approximately 60 % for sexual parasites. Compared to in vitro cultures of parasites, blood samples showed low hemozoin concentrations.
    Conclusions: This study highlights the potential of NTA as a useful method for analyzing hemozoin, demonstrating its ability to provide detailed information on hemozoin characterization. However, further research is needed to adapt the NTA for hemozoin analysis.
    MeSH term(s) Animals ; Humans ; Parasites ; Plasmodium ; Hemeproteins ; Malaria/parasitology ; Plasmodium falciparum
    Chemical Substances hemozoin (39404-00-7) ; Hemeproteins
    Language English
    Publishing date 2023-12-20
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 210415-5
    ISSN 1873-6254 ; 0001-706X
    ISSN (online) 1873-6254
    ISSN 0001-706X
    DOI 10.1016/j.actatropica.2023.107105
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Mycotoxin concentrations in rice from three climatic locations in Africa as affected by grain quality, production site, and storage duration.

    Tang, Erasmus N / Ndindeng, Sali A / Bigoga, Jude / Traore, Karim / Silue, Drissa / Futakuchi, Koichi

    Food science & nutrition

    2019  Volume 7, Issue 4, Page(s) 1274–1287

    Abstract: Information on the mycotoxin contamination of rice in Africa is limited although the risk of contamination is high. In this study, domestic milled rice processed by actors using suboptimal methods was purchased and total fumonisin (FUM), zearalenone, and ...

    Abstract Information on the mycotoxin contamination of rice in Africa is limited although the risk of contamination is high. In this study, domestic milled rice processed by actors using suboptimal methods was purchased and total fumonisin (FUM), zearalenone, and aflatoxin concentrations determined at 0, 90, and 180 days after storage. Three different climatic locations, Cotonou (Benin) in the Guinea savanna, Yaoundé (Cameroon) in the Tropical forest, and N'diaye (Senegal) in the Sahel, were selected as storage sites. Subsets of the samples collected from Glazoue (Benin), Ndop (Cameroon), and Dagana (Senegal) were stored in plastic woven bags under room conditions in the respective sites with or without calcium oxide (burnt scallop shell-BSS, 0.1% w/w) treatment. Multivariance analysis showed that FUM concentration was positively influenced by the duration of storage only while zearalenone concentration was negatively influenced by relative humidity and head rice but positively by impurities. Zearalenone concentration was also influenced by sample collection/storage location, processing type, and duration of storage. Aflatoxin concentration was influenced negatively by storage room temperature and head rice but positively by impurities and chalky grains. In addition, aflatoxin concentration was influenced by collection/storage location and processing type. BSS treatment followed by storage for 6 months had no effect on the concentration of the three assessed mycotoxins. Strategies to reduce the risk of mycotoxin contamination in study sites will include the improvement of physical rice quality through better pre- and postharvest practices and proper packaging of both treated rice and untreated rice in hermetic systems before marketing and storage.
    Language English
    Publishing date 2019-02-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2703010-6
    ISSN 2048-7177
    ISSN 2048-7177
    DOI 10.1002/fsn3.959
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Gene expression analyses reveal differences in children's response to malaria according to their age.

    Tebben, Kieran / Yirampo, Salif / Coulibaly, Drissa / Koné, Abdoulaye K / Laurens, Matthew B / Stucke, Emily M / Dembélé, Ahmadou / Tolo, Youssouf / Traoré, Karim / Niangaly, Amadou / Berry, Andrea A / Kouriba, Bourema / Plowe, Christopher V / Doumbo, Ogobara K / Lyke, Kirsten E / Takala-Harrison, Shannon / Thera, Mahamadou A / Travassos, Mark A / Serre, David

    Nature communications

    2024  Volume 15, Issue 1, Page(s) 2021

    Abstract: In Bandiagara, Mali, children experience on average two clinical malaria episodes per year. However, even in the same transmission area, the number of uncomplicated symptomatic infections, and their parasitemia, can vary dramatically among children. We ... ...

    Abstract In Bandiagara, Mali, children experience on average two clinical malaria episodes per year. However, even in the same transmission area, the number of uncomplicated symptomatic infections, and their parasitemia, can vary dramatically among children. We simultaneously characterize host and parasite gene expression profiles from 136 Malian children with symptomatic falciparum malaria and examine differences in the relative proportion of immune cells and parasite stages, as well as in gene expression, associated with infection and or patient characteristics. Parasitemia explains much of the variation in host and parasite gene expression, and infections with higher parasitemia display proportionally more neutrophils and fewer T cells, suggesting parasitemia-dependent neutrophil recruitment and/or T cell extravasation to secondary lymphoid organs. The child's age also strongly correlates with variations in gene expression: Plasmodium falciparum genes associated with age suggest that older children carry more male gametocytes, while variations in host gene expression indicate a stronger innate response in younger children and stronger adaptive response in older children. These analyses highlight the variability in host responses and parasite regulation during P. falciparum symptomatic infections and emphasize the importance of considering the children's age when studying and treating malaria infections.
    MeSH term(s) Child ; Humans ; Male ; Adolescent ; Parasitemia/genetics ; Malaria ; Gene Expression Profiling ; Malaria, Falciparum/genetics ; Cell Movement
    Language English
    Publishing date 2024-03-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-024-46416-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Gene expression analyses reveal differences in children's response to malaria according to their age.

    Tebben, Kieran / Yirampo, Salif / Coulibaly, Drissa / Koné, Abdoulaye / Laurens, Matthew / Stucke, Emily / Dembélé, Ahmadou / Tolo, Youssouf / Traoré, Karim / Niangaly, Ahmadou / Berry, Andrea / Kouriba, Bourema / Plowe, Christopher / Doumbo, Ogobara / Lyke, Kirsten / Takala-Harrison, Shannon / Thera, Mahamadou / Travassos, Mark / Serre, David

    Research square

    2023  

    Abstract: In Bandiagara, Mali, children experience on average two clinical malaria episodes per season. However, even in the same transmission area, the number of uncomplicated symptomatic infections, and their parasitemia, vary dramatically among children. To ... ...

    Abstract In Bandiagara, Mali, children experience on average two clinical malaria episodes per season. However, even in the same transmission area, the number of uncomplicated symptomatic infections, and their parasitemia, vary dramatically among children. To examine the factors contributing to these variations, we simultaneously characterized the host and parasite gene expression profiles from 136 children with symptomatic falciparum malaria and analyzed the expression of 9,205 human and 2,484 Plasmodium genes. We used gene expression deconvolution to estimate the relative proportion of immune cells and parasite stages in each sample and to adjust the differential gene expression analyses. Parasitemia explained much of the variation in both host and parasite gene expression and revealed that infections with higher parasitemia had more neutrophils and fewer T cells, suggesting parasitemia-dependent neutrophil recruitment and/or T cell extravasation to secondary lymphoid organs. The child's age was also strongly correlated with gene expression variations. Plasmodium falciparum genes associated with age suggested that older children carried more male gametocytes, while host genes associated with age indicated a stronger innate response (through TLR and NLR signaling) in younger children and stronger adaptive immunity (through TCR and BCR signaling) in older children. These analyses highlight the variability in host responses and parasite regulation during P. falciparum symptomatic infections and emphasize the importance of considering the children's age when studying and treating malaria infections.
    Language English
    Publishing date 2023-10-27
    Publishing country United States
    Document type Preprint
    DOI 10.21203/rs.3.rs-3487114/v1
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  6. Article: Trends in flood events and their relationship to extreme rainfall in an urban area of Sahelian West Africa: The case study of Ouagadougou, Burkina Faso

    Tazen, Fowe / Diarra, Abdoulaye / Kabore, Rodrigue F.W. / Ibrahim, Boubacar / Bologo/Traoré, Maïmouna / Traoré, Karim / Karambiri, Harouna

    Journal of flood risk management. 2019 Oct., v. 12 Suppl S1

    2019  

    Abstract: Urban areas in Sahelian West Africa are highly vulnerable to extreme hydro‐meteorological events. In recent years, Burkina Faso has experienced several natural disasters with floods being the most frequent. This study investigates flood trends in ... ...

    Abstract Urban areas in Sahelian West Africa are highly vulnerable to extreme hydro‐meteorological events. In recent years, Burkina Faso has experienced several natural disasters with floods being the most frequent. This study investigates flood trends in Ouagadougou and their relationship to extreme rainfall events. Fourteen rainfall indices were analysed to characterise the frequency and intensity of extreme rainfall. A frequency analysis of annual maximum daily rainfall series was performed using three statistical distributions. The results showed that few of the rainfall indices have significant trends at 5% level over the period 1961–2015. The generalised extreme value distribution satisfactorily fit the time‐series of annual maximum daily rainfall. An analysis of media flood reports revealed that Burkina Faso experienced approximately three flood events per year throughout the period 1986–2016. In the 2000s, the number of flood events increased to five per year. Most flood events are caused by rainfall events with return periods of less than or equal to 5 years. The results indicated that the significant increase in flood risk in Ouagadougou is not only related to heavy rainfall but also due to human and environmental factors.
    Keywords Sahel ; case studies ; humans ; hydrometeorology ; rain ; risk ; risk management ; time series analysis ; urban areas ; Burkina Faso
    Language English
    Dates of publication 2019-10
    Publishing place Blackwell Publishing Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2430376-8
    ISSN 1753-318X
    ISSN 1753-318X
    DOI 10.1111/jfr3.12507
    Database NAL-Catalogue (AGRICOLA)

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  7. Book ; Thesis: Effects of soil amendments and drought on zinc husbandry and grain quality in Sahelian sorghum

    Traore, Karim

    2006  

    Author's details Karim Traore
    Language English
    Size 162 p. :, ill., map ;, 24 cm.
    Publisher s.n
    Publishing place Wageningen
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Thesis (doctoral)--Wageningen Universiteit, 2006
    Note Summary in Dutch. ; "Propositions" inserted. ; Vita.
    ISBN 9085044375 ; 9789085044376
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Do advanced glycation end-products play a role in malaria susceptibility?

    Traoré, Karim / Arama, Charles / Médebielle, Maurice / Doumbo, Ogobara / Picot, Stéphane

    Parasite (Paris, France)

    2016  Volume 23, Page(s) 15

    Abstract: There are growing data supporting the differences in susceptibility to malaria described between sympatric populations with different lifestyles. Evidence has also been growing for some time that nutritional status and the host's metabolism are part of ... ...

    Abstract There are growing data supporting the differences in susceptibility to malaria described between sympatric populations with different lifestyles. Evidence has also been growing for some time that nutritional status and the host's metabolism are part of the complex mechanisms underlying these differences. The role of dietary advanced glycation end-products (AGEs) in the modulation of immune responses (innate and adaptive responses) and chronic oxidative stress has been established. But less is known about AGE implication in naturally acquired immunity and susceptibility to malaria. Since inflammatory immune responses and oxidative events have been demonstrated as the hallmark of malaria infection, it seems crucial to investigate the role of AGE in susceptibility or resistance to malaria. This review provides new insight into the relationship between nutrition, metabolic disorders, and infections, and how this may influence the mechanisms of susceptibility or resistance to malaria in endemic areas.
    MeSH term(s) Chromosomes, Human, Pair 6/genetics ; Cooking ; Diet/adverse effects ; Disease Susceptibility ; Endemic Diseases ; Ethnic Groups/genetics ; Evolution, Molecular ; Genetic Predisposition to Disease ; Glycation End Products, Advanced/adverse effects ; HMGB1 Protein/physiology ; Host-Parasite Interactions/genetics ; Host-Parasite Interactions/immunology ; Humans ; Immunity, Innate ; Life Style ; Major Histocompatibility Complex/genetics ; Malaria/epidemiology ; Malaria/etiology ; Malaria/genetics ; Malaria/immunology ; Nutritional Status ; Plasmodium/genetics ; Plasmodium/physiology ; Polymorphism, Single Nucleotide ; Receptor for Advanced Glycation End Products/genetics ; Receptor for Advanced Glycation End Products/physiology ; Selection, Genetic
    Chemical Substances AGER protein, human ; Glycation End Products, Advanced ; HMGB1 Protein ; HMGB1 protein, human ; Receptor for Advanced Glycation End Products
    Language English
    Publishing date 2016
    Publishing country France
    Document type Journal Article ; Review
    ZDB-ID 1187629-3
    ISSN 1776-1042 ; 1252-607X
    ISSN (online) 1776-1042
    ISSN 1252-607X
    DOI 10.1051/parasite/2016015
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Shifts in the clinical epidemiology of severe malaria after scaling up control strategies in Mali.

    Coulibaly, Drissa / Kone, Abdoulaye K / Kane, Bourama / Guindo, Bouréima / Tangara, Bourama / Sissoko, Mody / Maiga, Fayçal / Traore, Karim / Diawara, Aichatou / Traore, Amidou / Thera, Ali / Sissoko, Mahamadou S / Doumbo, Ogobara K / Travassos, Mark A / Thera, Mahamadou A

    Frontiers in neurology

    2022  Volume 13, Page(s) 988960

    Abstract: A decrease in malaria incidence following implementation of control strategies such as use of artemisinin-based combination therapies, insecticide-impregnated nets, intermittent preventive treatment during pregnancy and seasonal malaria chemoprevention ( ... ...

    Abstract A decrease in malaria incidence following implementation of control strategies such as use of artemisinin-based combination therapies, insecticide-impregnated nets, intermittent preventive treatment during pregnancy and seasonal malaria chemoprevention (SMC) has been observed in many parts of Africa. We hypothesized that changes in malaria incidence is accompanied by a change in the predominant clinical phenotypes of severe malaria. To test our hypothesis, we used data from a severe malaria case-control study that lasted from 2014-2019 to describe clinical phenotypes of severe forms experienced by participants enrolled in Bandiagara, Bamako, and Sikasso, in Mali. We also analyzed data from hospital records of inpatient children at a national referral hospital in Bamako. Among 97 cases of severe malaria in the case-control study, there was a predominance of severe malarial anemia (49.1%). The frequency of cerebral malaria was 35.4, and 16.5% of cases had a mixed clinical phenotype (concurrent cerebral malaria and severe anemia). National referral hospital record data in 2013-15 showed 24.3% of cases had severe malarial anemia compared to 51.7% with cerebral malaria. In the years after SMC scale-up, severe malarial anemia cases increased to 30.1%, (
    Language English
    Publishing date 2022-11-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2564214-5
    ISSN 1664-2295
    ISSN 1664-2295
    DOI 10.3389/fneur.2022.988960
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  10. Article ; Online: IFNγ, TNFα polymorphisms and IFNγ serum levels are associated with the clearance of drug-resistant P. falciparum in Malian children.

    Kouriba, Bourema / Arama, Charles / Ouologuem, Dinkorma T / Cissoko, Yacouba / Diakite, Mahamadou / Beavogui, Abdoul Habib / Wele, Mamadou / Tekete, Mamadou / Fofana, Bakary / Dama, Souleymane / Maiga, Hamma / Kone, Aminatou / Niangaly, Amadou / Diarra, Issa / Daou, Modibo / Guindo, Ando / Traore, Karim / Coulibaly, Drissa / Kone, Abdoulaye K /
    Dicko, Alassane / Clark, Taane G / Doumbo, Ogobara K / Djimde, Abdoulaye

    Cytokine

    2023  Volume 164, Page(s) 156137

    Abstract: Host immunity has been suggested to clear drug-resistant parasites in malaria-endemic settings. However, the immunogenetic mechanisms involved in parasite clearance are poorly understood. Characterizing the host's immunity and genes involved in ... ...

    Abstract Host immunity has been suggested to clear drug-resistant parasites in malaria-endemic settings. However, the immunogenetic mechanisms involved in parasite clearance are poorly understood. Characterizing the host's immunity and genes involved in controlling the parasitic infection can inform the development of blood-stage malaria vaccines. This study investigates host regulatory cytokines and immunogenomic factors associated with the clearance of Plasmodium falciparum carrying a chloroquine resistance genotype. Biological samples from participants of previous drug efficacy trials conducted in two Malian localities were retrieved. The P. falciparum chloroquine resistance transporter (Pfcrt) gene was genotyped using parasite DNA. Children carrying parasites with the mutant allele (Pfcrt-76T) were classified based on their ability to clear their parasites. The levels of the different cytokines were measured in serum. The polymorphisms of specific human genes involved in malaria susceptibility were genotyped using human DNA. The prevalence of the Pfcrt-76T was significantly higher in Kolle than in Bandiagara (81.6 % vs 38.6 %, p < 10
    MeSH term(s) Humans ; Child ; Antimalarials/pharmacology ; Tumor Necrosis Factor-alpha/genetics ; Tumor Necrosis Factor-alpha/therapeutic use ; Drug Resistance/genetics ; Protozoan Proteins/genetics ; Chloroquine/pharmacology ; Malaria, Falciparum/genetics ; Malaria, Falciparum/drug therapy ; Malaria, Falciparum/parasitology ; Plasmodium falciparum/genetics ; Membrane Transport Proteins/genetics ; Membrane Transport Proteins/therapeutic use ; Malaria/drug therapy
    Chemical Substances Antimalarials ; Tumor Necrosis Factor-alpha ; Protozoan Proteins ; Chloroquine (886U3H6UFF) ; Membrane Transport Proteins
    Language English
    Publishing date 2023-02-09
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1018055-2
    ISSN 1096-0023 ; 1043-4666
    ISSN (online) 1096-0023
    ISSN 1043-4666
    DOI 10.1016/j.cyto.2023.156137
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