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Malaria Journal

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https://www.readbyqxmd.com/read/28938907/integrative-analysis-associates-monocytes-with-insufficient-erythropoiesis-during-acute-plasmodium-cynomolgi-malaria-in-rhesus-macaques
#1
Yan Tang, Chester J Joyner, Monica Cabrera-Mora, Celia L Saney, Stacey A Lapp, Mustafa V Nural, Suman B Pakala, Jeremy D DeBarry, Stephanie Soderberg, Jessica C Kissinger, Tracey J Lamb, Mary R Galinski, Mark P Styczynski
BACKGROUND: Mild to severe anaemia is a common complication of malaria that is caused in part by insufficient erythropoiesis in the bone marrow. This study used systems biology to evaluate the transcriptional and alterations in cell populations in the bone marrow during Plasmodium cynomolgi infection of rhesus macaques (a model of Plasmodium vivax malaria) that may affect erythropoiesis. RESULTS: An appropriate erythropoietic response did not occur to compensate for anaemia during acute cynomolgi malaria despite an increase in erythropoietin levels...
September 22, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28938906/international-survey-to-identify-diagnostic-needs-to-support-malaria-elimination-guiding-the-development-of-combination-highly-sensitive-rapid-diagnostic-tests
#2
Ana Campillo, Jennifer Daily, Iveth J González
BACKGROUND: In malaria elimination settings, the very low levels of transmission now being attained present challenges that demand new strategies to identify and treat low-density infections in both symptomatic and asymptomatic populations. Accordingly, passive case detection activities need to be supplemented by active case detection (ACD) strategies with more sensitive diagnostic tools. Malaria rapid diagnostic tests (RDTs) have provided low- and middle-income countries with unprecedented access to malaria diagnostics...
September 22, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28934959/selective-inhibition-of-pfa-m1-over-pfa-m17-by-an-amino-benzosuberone-derivative-blocks-malaria-parasites-development-in-vitro-and-in-vivo
#3
Lotfi Bounaadja, Marjorie Schmitt, Sébastien Albrecht, Elisabeth Mouray, Céline Tarnus, Isabelle Florent
BACKGROUND: Plasmodium falciparum M1 family aminopeptidase is currently considered as a promising target for anti-malarial chemotherapy. Several series of inhibitors developed by various research groups display IC50/Ki values down to nM range on native PfA-M1 or recombinant forms and block the parasite development in culture at µM to sub-µM concentrations. A handful of these inhibitors has been tested on murine models of malaria and has shown anti plasmodial in vivo activity. However, most of these inhibitors do also target the other neutral malarial aminopeptidase, PfA-M17, often with lower Ki values, which questions the relative involvement and importance of each enzyme in the parasite biology...
September 21, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28934955/the-drug-transporter-abcb1-c-3435c-t-snp-influences-artemether-lumefantrine-treatment-outcome
#4
Kinanga Kiaco, António Sebastião Rodrigues, Virgílio do Rosário, José Pedro Gil, Dinora Lopes
Malaria treatment performance is potentially influenced by pharmacogenetic factors. This study reports an association study between the ABCB1 c.3435C>T, CYP3A4*1B (g.-392A>G), CYP3A5*3 (g.6986A>G) SNPs and artemether + lumefantrine treatment outcome in 103 uncomplicated malaria patients from Angola. No significant associations with the CYP3A4*1B and CYP3A5*3 were observed, while a significant predominance of the ABCB1 c.3435CC genotype was found among the recurrent infection-free patients (p < 0...
September 21, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28931399/principles-practices-and-knowledge-of-clinicians-when-assessing-febrile-children-a-qualitative-study-in-kenya
#5
Anneka M Hooft, Kelsey Ripp, Bryson Ndenga, Francis Mutuku, David Vu, Kimberly Baltzell, Linnet N Masese, John Vulule, Dunstan Mukoko, A Desiree LaBeaud
BACKGROUND: Clinicians in low resource settings in malaria endemic regions face many challenges in diagnosing and treating febrile illnesses in children. Given the change in WHO guidelines in 2010 that recommend malaria testing prior to treatment, clinicians are now required to expand the differential when malaria testing is negative. Prior studies have indicated that resource availability, need for additional training in differentiating non-malarial illnesses, and lack of understanding within the community of when to seek care play a role in effective diagnosis and treatment...
September 20, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28927422/proximity-to-vector-breeding-site-and-risk-of-plasmodium-vivax-infection-a-prospective-cohort-study-in-rural-ethiopia
#6
Alexander Nissen, Jackie Cook, Eskindir Loha, Bernt Lindtjørn
BACKGROUND: Despite falling incidence and mortality since the turn of the century, malaria remains an important global health challenge. In the future fight against malaria, greater emphasis will have to be placed on understanding and addressing malaria caused by the Plasmodium vivax parasite. Unfortunately, due to years of neglect and underfunding, there are currently many gaps in knowledge of P. vivax malaria. The aims of the present study were to explore the association between distance to vector breeding site and P...
September 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28927420/erratum-to-composition-of-anopheles-mosquitoes-their-blood-meal-hosts-and-plasmodium-falciparum-infection-rates-in-three-islands-with-disparate-bed-net-coverage-in-lake-victoria-kenya
#7
Edwin Ogola, Jandouwe Villinger, Danspaid Mabuka, David Omondi, Benedict Orindi, James Mutunga, Vincent Owino, Daniel K Masiga
After publication of the article [1], it has been brought to our attention that a funding acknowledgement has been omitted from the original article. The authors would like to include the following, "The study was undertaken as part of the Target Malaria consortium, which receives core funding from the Bill & Melinda Gates Foundation & from the Open Philanthropy Project Fund, an advised fund of Silicon Valley Community Foundation."
September 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28927405/the-use-of-respondent-driven-sampling-to-assess-malaria-knowledge-treatment-seeking-behaviours-and-preventive-practices-among-mobile-and-migrant-populations-in-a-setting-of-artemisinin-resistance-in-western-cambodia
#8
Po Ly, Julie Thwing, Colleen McGinn, Cesia E Quintero, Narann Top-Samphor, Najibullah Habib, Jack S Richards, Sara E Canavati, Seshu Babu Vinjamuri, Chea Nguon
BACKGROUND: Multi-drug-resistant Plasmodium falciparum threatens malaria elimination efforts in Cambodia and the Greater Mekong Subregion (GMS). Malaria burden in the GMS is higher among certain high-risk demographic groups in Cambodia, especially among migrant and mobile populations (MMPs). This respondent driven sampling (RDS) study was conducted in order to determine malaria knowledge, treatment-seeking behaviours and preventive practices among two MMP groups in Western Cambodia. METHODS: An RDS survey of MMPs was implemented in four purposively-selected communes along the Thai-Cambodia border; two in Veal Veang District and two in Pailin Province, chosen due to their sizeable MMP groups, their convenience of access, and their proximity to Thailand, which allowed for comparison with RDS studies in Thailand...
September 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28923063/a-stochastic-model-for-the-probability-of-malaria-extinction-by-mass-drug-administration
#9
Peter Pemberton-Ross, Nakul Chitnis, Emilie Pothin, Thomas A Smith
BACKGROUND: Mass drug administration (MDA) has been proposed as an intervention to achieve local extinction of malaria. Although its effect on the reproduction number is short lived, extinction may subsequently occur in a small population due to stochastic fluctuations. This paper examines how the probability of stochastic extinction depends on population size, MDA coverage and the reproduction number under control, R c . A simple compartmental model is developed which is used to compute the probability of extinction using probability generating functions...
September 18, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28923058/a-model-of-plasmodium-vivax-concealment-based-on-plasmodium-cynomolgi-infections-in-macaca-mulatta
#10
Luis L Fonseca, Chester J Joyner, Mary R Galinski, Eberhard O Voit
BACKGROUND: Plasmodium vivax can cause severe malaria. The total parasite biomass during infections is correlated with the severity of disease but not necessarily quantified accurately by microscopy. This finding has raised the question whether there could be sub-populations of parasites that are not observed in peripheral blood smears but continue to contribute to the increase in parasite numbers that drive pathogenesis. Non-human primate infection models utilizing the closely related simian malaria parasite Plasmodium cynomolgi hold the potential for quantifying the magnitude of possibly unobserved infected red blood cell (iRBC) populations and determining how the presence of this hidden reservoir correlates with disease severity...
September 18, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28923054/a-novel-method-for-extracting-nucleic-acids-from-dried-blood-spots-for-ultrasensitive-detection-of-low-density%C3%A2-plasmodium-falciparum-and-plasmodium-vivax%C3%A2-infections
#11
Kayvan Zainabadi, Matthew Adams, Zay Yar Han, Hnin Wai Lwin, Kay Thwe Han, Amed Ouattara, Si Thura, Christopher V Plowe, Myaing M Nyunt
BACKGROUND: Greater Mekong Subregion countries are committed to eliminating Plasmodium falciparum malaria by 2025. Current elimination interventions target infections at parasite densities that can be detected by standard microscopy or rapid diagnostic tests (RDTs). More sensitive detection methods have been developed to detect lower density "asymptomatic" infections that may represent an important transmission reservoir. These ultrasensitive polymerase chain reaction (usPCR) tests have been used to identify target populations for mass drug administration (MDA)...
September 18, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28915896/placental-malaria-and-its-effect-on-pregnancy-outcomes-in-sudanese-women-from-blue-nile-state
#12
Samia A Omer, Hagir E Idress, Ishag Adam, Mutasim Abdelrahim, Ali N Noureldein, Abdelrahim M Abdelrazig, Mohammed O Elhassan, Suad M Sulaiman
BACKGROUND: Malaria infection during pregnancy can result in placental malaria and is associated with adverse pregnancy outcomes particularly among primigravidae. The aim of this study was to assess the prevalence and risk factors for placental malaria and its effect on pregnancy outcomes in Blue Nile state, Sudan. METHODS: A cross-sectional hospital-based study was conducted consecutively during January 2012-December 2015 in three main hospitals in Blue Nile State, Sudan...
September 16, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28915892/modelling-the-impact-of-the-long-term-use-of-insecticide-treated-bed-nets-on-anopheles-mosquito-biting-time
#13
Claudia P Ferreira, Silas P Lyra, Franciane Azevedo, David Greenhalgh, Eduardo Massad
BACKGROUND: Evidence of changing in biting and resting behaviour of the main malaria vectors has been mounting up in recent years as a result of selective pressure by the widespread and long-term use of insecticide-treated bed nets (ITNs), and indoor residual spraying. The impact of resistance behaviour on malaria intervention efficacy has important implications for the epidemiology and malaria control programmes. In this context, a theoretical framework is presented to understand the mechanisms determining the evolution of feeding behaviour under the pressure of use of ITNs...
September 15, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28903758/factors-associated-with-malaria-microscopy-diagnostic-performance-following-a-pilot-quality-assurance-programme-in-health-facilities-in-malaria-low-transmission-areas-of-kenya-2014
#14
Fredrick Odhiambo, Ann M Buff, Collins Moranga, Caroline M Moseti, Jesca Okwara Wesongah, Sara A Lowther, Wences Arvelo, Tura Galgalo, Thomas O Achia, Zeinab G Roka, Waqo Boru, Lily Chepkurui, Bernhards Ogutu, Elizabeth Wanja
BACKGROUND: Malaria accounts for ~21% of outpatient visits annually in Kenya; prompt and accurate malaria diagnosis is critical to ensure proper treatment. In 2013, formal malaria microscopy refresher training for microscopists and a pilot quality-assurance (QA) programme for malaria diagnostics were independently implemented to improve malaria microscopy diagnosis in malaria low-transmission areas of Kenya. A study was conducted to identify factors associated with malaria microscopy performance in the same areas...
September 13, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28903755/prevalence-of-k13-mutation-and-day-3-positive-parasitaemia-in-artemisinin-resistant-malaria-endemic-area-of-cambodia-a-cross-sectional-study
#15
Soy Ty Kheang, Siv Sovannaroth, Sovann Ek, Say Chy, Phally Chhun, Sokkieng Mao, Sokomar Nguon, Dy Soley Lek, Didier Menard, Neeraj Kak
BACKGROUND: The presence of artemisinin-resistant malaria parasites was confirmed in western Cambodia in 2009. In 2013, mutations in the propeller domain of the kelch protein K13 was found to be associated with artemisinin resistance. A cross-sectional study was conducted to determine the prevalence of Day-3 parasitaemia, estimate the frequency of k13 molecular marker and assess their relationship in the context of operational research. METHODS: Blood smears and filter paper blood spots were collected from febrile patients in Kravanh District, Pursat Province...
September 13, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28899387/cognitive-performance-of-children-living-in-endemic-areas-for-plasmodium-vivax
#16
Laélia M B F Brasil, José L F Vieira, Eliete C Araújo, Pedro P F Piani, Rosa M Dias, Ana M R S Ventura, Bianca C Cabral, Renée C R Santa Brígida, Marcieni A de Andrade
BACKGROUND: The role of repeated episodes of malaria on the cognitive development of children is a relevant issue in endemic areas since it can have a long-lasting impact on individual lifespan. The aim of the current paper was to investigate whether the history of malaria can impair the verbal and performance skills of children living in an endemic area with low transmission of Plasmodium vivax malaria. METHODS: A cross-sectional study was conducted with children living in an endemic area of P...
September 12, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28899382/carrion-crows-corvus-corone-of-southwest-germany-important-hosts-for-haemosporidian-parasites
#17
Sandrine Schmid, Katrin Fachet, Anke Dinkel, Ute Mackenstedt, Friederike Woog
BACKGROUND: Avian malaria parasites (Plasmodium spp.) and other Haemosporida (Haemoproteus and Leucocytozoon spp.) form a diverse group of vector-transmitted blood parasites that are abundant in many bird families. Recent studies have suggested that corvids may be an important host for Plasmodium spp. and Leucocytozoon spp. METHODS: To investigate the diversity of Haemosporida of resident carrion crows (Corvus corone) and Eurasian Magpies (Pica pica) in southwest Germany, 100 liver samples of corvids were examined using a nested PCR method to amplify a 1063 bp fragment of the haemosporidian mitochondrial cytochrome b gene...
September 12, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28899381/ned-19-inhibition-of-parasite-growth-and-multiplication-suggests-a-role-for-naadp-mediated-signalling-in-the-asexual-development-of-plasmodium-falciparum
#18
Pablo Suárez-Cortés, Guido Gambara, Annarita Favia, Fioretta Palombi, Pietro Alano, Antonio Filippini
BACKGROUND: Although malaria is a preventable and curable human disease, millions of people risk to be infected by the Plasmodium parasites and to develop this illness. Therefore, there is an urgent need to identify new anti-malarial drugs. Ca(2+) signalling regulates different processes in the life cycle of Plasmodium falciparum, representing a suitable target for the development of new drugs. RESULTS: This study investigated for the first time the effect of a highly specific inhibitor of nicotinic acid adenine dinucleotide phosphate (NAADP)-induced Ca(2+) release (Ned-19) on P...
September 12, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28899379/spatial-models-for-the-rational-allocation-of-routinely-distributed-bed-nets-to-public-health-facilities-in-western-kenya
#19
Peter M Macharia, Patroba A Odera, Robert W Snow, Abdisalan M Noor
BACKGROUND: In high to moderate malaria transmission areas of Kenya, long-lasting insecticidal nets (LLINs) are provided free of charge to pregnant women and infants during routine antenatal care (ANC) and immunization respectively. Quantities of LLINs distributed to clinics are quantified based on a combination of monthly consumption data and population size of target counties. However, this approach has been shown to lead to stock-outs in targeted clinics. In this study, a novel LLINs need quantification approach for clinics in the routine distribution system was developed...
September 12, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28899373/maximizing-the-impact-of-malaria-funding-through-allocative-efficiency-using-the-right-interventions-in-the-right-locations
#20
Nick Scott, S Azfar Hussain, Rowan Martin-Hughes, Freya J I Fowkes, Cliff C Kerr, Ruth Pearson, David J Kedziora, Madhura Killedar, Robyn M Stuart, David P Wilson
BACKGROUND: The high burden of malaria and limited funding means there is a necessity to maximize the allocative efficiency of malaria control programmes. Quantitative tools are urgently needed to guide budget allocation decisions. METHODS: A geospatial epidemic model was coupled with costing data and an optimization algorithm to estimate the optimal allocation of budgeted and projected funds across all malaria intervention approaches. Interventions included long-lasting insecticide-treated nets (LLINs), indoor residual spraying (IRS), intermittent presumptive treatment during pregnancy (IPTp), seasonal mass chemoprevention in children (SMC), larval source management (LSM), mass drug administration (MDA), and behavioural change communication (BCC)...
September 12, 2017: Malaria Journal
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