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https://www.readbyqxmd.com/read/28646586/vaccine-candidate-discovery-for-the-next-generation-of-malaria-vaccines
#1
REVIEW
James Tuju, Gathoni Kamuyu, Linda M Murungi, Faith H A Osier
Although epidemiological observations, IgG passive transfer studies and experimental infections in humans all support the feasibility of developing highly effective malaria vaccines, the precise antigens that induce protective immunity remain uncertain. Here, we review the methodologies applied to vaccine candidate discovery for Plasmodium falciparum malaria from the pre- to post- genomic era. Probing of genomic and/or cDNA libraries with antibodies of defined specificities or functional activity predominated the former, while reverse vaccinology encompassing high throughput in silico analyses of genomic, transcriptomic or proteomic parasite datasets is the mainstay of the latter...
June 24, 2017: Immunology
https://www.readbyqxmd.com/read/28645255/haemoglobin-changes-and-risk-of-anaemia-following-treatment-for-uncomplicated-falciparum-malaria-in-sub-saharan-africa
#2
Julien Zwang, Umberto D'Alessandro, Jean-Louis Ndiaye, Abdoulaye A Djimdé, Grant Dorsey, Andreas A Mårtensson, Corine Karema, Piero L Olliaro
BACKGROUND: Anaemia is common in malaria. It is important to quantitate the risk of anaemia and to distinguish factors related to the natural history of disease from potential drug toxicity. METHODS: Individual-patient data analysis based on nine randomized controlled trials of treatments of uncomplicated falciparum malaria from 13 sub-Saharan African countries. Risk factors for reduced haemoglobin (Hb) concentrations and anaemia on presentation and after treatment were analysed using mixed effect models...
June 23, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28639487/mrp2-abcc2-c1515y-polymorphism-modulates-exposure-to-lumefantrine-during-artemether-lumefantrine-antimalarial-therapy
#3
Karin Vos, Carlotta Lo Sciuto, Rita Piedade, Michael Ashton, Anders Björkman, Billy Ngasala, Andreas Mårtensson, José Pedro Gil
AIM: To investigate the potential involvement of the hepatic ATP-binding cassette transporters MRP2 and MDR1 in the disposition of lumefantrine (LUM) among patients with uncomplicated Plasmodium falciparum malaria. MATERIALS & METHODS: The tag SNPs MDR1/ABCB1 C3435T and MRP2/ABCC2 C1515Y were determined in two artemether-LUM clinical trials, including a pharmacokinetic/pharmacodynamic study focused on the treatment phase (72 h), and an efficacy trial where day 7 (D7) LUM levels were measured...
June 22, 2017: Pharmacogenomics
https://www.readbyqxmd.com/read/28619089/light-manipulation-of-mosquito-behaviour-acute-and-sustained-photic-suppression-of-biting-activity-in-the-anopheles-gambiae-malaria-mosquito
#4
Aaron D Sheppard, Samuel S C Rund, Gary F George, Erin Clark, Dominic J Acri, Giles E Duffield
BACKGROUND: Host-seeking behaviours in anopheline mosquitoes are time-of-day specific, with a greater propensity for nocturnal biting. We investigated how a short exposure to light presented during the night or late day can inhibit biting activity and modulate flight activity behaviour. RESULTS: Anopheles gambiae (s.s.), maintained on a 12:12 LD cycle, were exposed transiently to white light for 10-min at the onset of night and the proportion taking a blood meal in a human biting assay was recorded every 2 h over an 8-h duration...
June 16, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28619071/new-adenovirus-based-vaccine-vectors-targeting-pfs25-elicit-antibodies-that-inhibit-plasmodium-falciparum-transmission
#5
Kathleen A McGuire, Kazutoyo Miura, Christopher M Wiethoff, Kim C Williamson
BACKGROUND: An effective malaria transmission-blocking vaccine (TBV) would be a major advance in the current efforts to eliminate and, ultimately, eradicate malaria. Antibodies against Plasmodium falciparum surface protein, Pfs25, are known to block parasite development in the mosquito vector. However, in initial clinical trials the limited immunogenicity of recombinant Pfs25 protein-in-adjuvant vaccines has been a challenge. METHODS: Novel human adenovirus type 5 (Ad5) vectors were used in heterologous prime boost vaccination strategies to augment the immune response against Pfs25...
June 15, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28618199/lipid-interactions-modulate-the-structural-and-antigenic-properties-of-the-c-terminal-domain-of-the-malaria-antigen-merozoite-surface-protein-2
#6
Sreedam C Das, Rodrigo A V Morales, Jeffrey Seow, Krishnarjuna Bankala, Ravindu Dissanayake, Robin F Anders, Christopher A MacRaild, Raymond S Norton
Merozoite surface protein 2 (MSP2) is a highly abundant, GPI-anchored antigen on the malaria parasite Plasmodium falciparum. MSP2 induces an immune response in the context of natural infections and vaccine trials, and these responses are associated with protection from parasite infection. Recombinant MSP2 is highly disordered in solution but antigenic analyses suggest that it is more ordered on the merozoite surface. We have shown previously that the interaction of recombinant full-length MSP2 with lipid surfaces induces a conformational change in the conserved N-terminal region of MSP2, which contributes to epitope masking in this region...
June 15, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28615258/effect-of-a-package-of-health-and-nutrition-services-on-sustained-recovery-in-children-after-moderate-acute-malnutrition-and-factors-related-to-sustaining-recovery-a-cluster-randomized-trial
#7
Heather C Stobaugh, Lucy B Bollinger, Sara E Adams, Audrey H Crocker, Jennifer B Grise, Julie A Kennedy, Chrissie Thakwalakwa, Kenneth M Maleta, Dennis J Dietzen, Mark J Manary, Indi Trehan
Background: Children who recover from moderate acute malnutrition (MAM) have high rates of relapse in the year after nutritional recovery. Interventions to decrease these adverse outcomes are needed to maximize the overall effectiveness of supplemental feeding programs (SFPs).Objectives: We evaluated the effectiveness of a package of health and nutrition interventions on improving the proportion of children who sustained recovery for 1 y after MAM treatment. We further explored factors related to sustained recovery...
June 14, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28606136/cost-analysis-of-a-school-based-comprehensive-malaria-program-in-primary-schools-in-sikasso-region-mali
#8
Roberta Maccario, Saba Rouhani, Tom Drake, Annie Nagy, Modibo Bamadio, Seybou Diarra, Souleymane Djanken, Natalie Roschnik, Siân E Clarke, Moussa Sacko, Simon Brooker, Josselin Thuilliez
BACKGROUND: The expansion of malaria prevention and control to school-aged children is receiving increasing attention, but there are still limited data on the costs of intervention. This paper analyses the costs of a comprehensive school-based intervention strategy, delivered by teachers, that included participatory malaria educational activities, distribution of long lasting insecticide-treated nets (LLIN), and Intermittent Parasite Clearance in schools (IPCs) in southern Mali. METHODS: Costs were collected alongside a randomised controlled trial conducted in 80 primary schools in Sikasso Region in Mali in 2010-2012...
June 12, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28605472/safety-and-efficacy-of-adding-a-single-low-dose-of-primaquine-to-the-treatment-of-adult-patients-with-plasmodium-falciparum-malaria-in-senegal-to-reduce-gametocyte-carriage-a-randomized-controlled-trial
#9
Roger C Tine, Khadime Sylla, Babacar T Faye, Eugenie Poirot, Fatou B Fall, Doudou Sow, Duolao Wang, Magatte Ndiaye, Jean Louis Ndiaye, Babacar Faye, Brian Greenwood, Oumar Gaye, Paul Milligan
Introduction.: More information is needed about the safety of low-dose primaquine in populations where G6PD deficiency is common. Methods.: Adults with Plasmodium falciparum malaria were randomized to receive 1 of 3 artemisinin combination therapies (ACTs) with or without primaquine (0.25 mg/kg). Glucose-6-phosphate dehydrogenase (G6PD) status was determined using a rapid test. Patients were followed for 28 days to record hemoglobin concentration, adverse events, and gametocyte carriage...
June 12, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28604122/blood-stage-malaria-vaccines-post-genome-strategies-for-the-identification-of-novel-vaccine-candidates
#10
Edward H Ntege, Eizo Takashima, Masayuki Morita, Hikaru Nagaoka, Tomoko Ishino, Takafumi Tsuboi
An efficacious malaria vaccine is necessary to advance the current control measures towards malaria elimination. To-date, only RTS,S/AS01, a leading pre-erythrocytic stage vaccine completed phase 3 trials, but with an efficacy of 28-36% in children, and 18-26% in infants, that waned over time. Blood-stage malaria vaccines protect against disease, and are considered effective targets for the logical design of next generation vaccines to improve the RTS,S field efficacy. Therefore, novel blood-stage vaccine candidate discovery efforts are critical, albeit with several challenges including, high polymorphisms in vaccine antigens, poor understanding of targets of naturally protective immunity, and difficulties in the expression of high AT-rich plasmodial proteins...
June 19, 2017: Expert Review of Vaccines
https://www.readbyqxmd.com/read/28596841/targeting-endosomal-acidification-by-chloroquine-analogs-as-a-promising-strategy-for-the-treatment-of-emerging-viral-diseases
#11
REVIEW
Md Abdul Alim Al-Bari
Emerging viruses such as HIV, dengue, influenza A, SARS coronavirus, Ebola, and other viruses pose a significant threat to human health. Majority of these viruses are responsible for the outbreaks of pathogenic lethal infections. To date, there are no effective therapeutic strategies available for the prophylaxis and treatment of these infections. Chloroquine analogs have been used for decades as the primary and most successful drugs against malaria. Concomitant with the emergence of chloroquine-resistant Plasmodium strains and a subsequent decrease in the use as antimalarial drugs, other applications of the analogs have been investigated...
February 2017: Pharmacology Research & Perspectives
https://www.readbyqxmd.com/read/28596090/liposomes-containing-monophosphoryl-lipid-a-and-qs-21-serve-as-an-effective-adjuvant-for-soluble-circumsporozoite-protein-malaria-vaccine-fmp013
#12
Christopher J Genito, Zoltan Beck, Timothy W Phares, Fanta Kalle, Keith J Limbach, Maureen E Stefaniak, Noelle B Patterson, Elke S Bergmann-Leitner, Norman C Waters, Gary R Matyas, Carl R Alving, Sheetij Dutta
Malaria caused by Plasmodium falciparum continues to threaten millions of people living in the tropical parts of the world. A vaccine that confers sterile and life-long protection remains elusive despite more than 30years of effort and resources invested in solving this problem. Antibodies to a malaria vaccine candidate circumsporozoite protein (CSP) can block invasion and can protect humans against malaria. We have manufactured the Falciparum Malaria Protein-013 (FMP013) vaccine based on the nearly full-length P...
June 5, 2017: Vaccine
https://www.readbyqxmd.com/read/28592572/impact-of-iron-fortification-on-the-geospatial-patterns-of-malaria-and-non-malaria-infection-risk-among-young-children-a-secondary-spatial-analysis-of-clinical-trial-data-from-ghana
#13
Ashley M Aimone, Patrick Brown, Seth Owusu-Agyei, Stanley H Zlotkin, Donald C Cole
OBJECTIVES: Patterns of infection among children with varying levels of iron status in a malaria endemic area may vary spatially in ways requiring integrated infection and iron deficiency control programmes. The objective of this secondary analysis was to determine the geospatial factors associated with malaria and non-malaria infection status among young Ghanaian children at the end of a 5-month iron intervention trial. DESIGN: Cluster-randomised controlled trial...
June 6, 2017: BMJ Open
https://www.readbyqxmd.com/read/28592250/community-based-intermittent-mass-testing-and-treatment-for-malaria-in-an-area-of-high-transmission-intensity-western-kenya-study-design-and-methodology-for-a-cluster-randomized-controlled-trial
#14
Aaron M Samuels, Nobert Awino, Wycliffe Odongo, Benard Abong'o, John Gimnig, Kephas Otieno, Ya Ping Shi, Vincent Were, Denise Roth Allen, Florence Were, Tony Sang, David Obor, John Williamson, Mary J Hamel, S Patrick Kachur, Laurence Slutsker, Kim A Lindblade, Simon Kariuki, Meghna Desai
Most human Plasmodium infections in western Kenya are asymptomatic and are believed to contribute importantly to malaria transmission. Elimination of asymptomatic infections requires active treatment approaches, such as mass testing and treatment (MTaT) or mass drug administration (MDA), as infected persons do not seek care for their infection. Evaluations of community-based approaches that are designed to reduce malaria transmission require careful attention to study design to ensure that important effects can be measured accurately...
June 7, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28591198/single-dose-primaquine-to-reduce-gametocyte-carriage-and-plasmodium-falciparum-transmission-in-cambodia-an-open-label-randomized-trial
#15
Jessica T Lin, Chanthap Lon, Michele D Spring, Somethy Sok, Soklyda Chann, Mali Ittiverakul, Worachet Kuntawunginn, Mok My, Kheangheng Thay, Rifat Rahman, Sujata Balasubramanian, Mengchuor Char, Charlotte A Lanteri, Panita Gosi, Ratawan Ubalee, Steven R Meshnick, David L Saunders
BACKGROUND: Single low dose primaquine (SLD PQ, 0.25mg/kg) is recommended in combination with artemisinin-based combination therapy (ACT) as a gametocytocide to prevent Plasmodium falciparum transmission in areas threatened by artemisinin resistance. To date, no randomized controlled trials have measured primaquine's effect on infectiousness to Anopheline mosquitoes in Southeast Asia. METHODS: Cambodian adults with uncomplicated falciparum malaria were randomized to receive a single 45mg dose of primaquine (equivalent to three SLD PQ) or no primaquine after the third dose of dihydroartemisin-piperaquine (DHP) therapy...
2017: PloS One
https://www.readbyqxmd.com/read/28588992/introducing-rapid-tests-for-malaria-into-the-retail-sector-what-are-the-unintended-consequences
#16
Eleanor Hutchinson, Coll Hutchison, Sham Lal, Kristian Hansen, Miriam Kayendeke, Christine Nabirye, Pascal Magnussen, Siân E Clarke, Anthony Mbonye, Clare I R Chandler
The observation that many people in Africa seek care for febrile illness in the retail sector has led to a number of public health initiatives to try to improve the quality of care provided in these settings. The potential to support the introduction of rapid diagnostic tests for malaria (mRDTs) into drug shops is coming under increased scrutiny. Those in favour argue that it enables the harmonisation of policy around testing and treatment for malaria and maintains a focus on market-based solutions to healthcare...
January 2017: BMJ Global Health
https://www.readbyqxmd.com/read/28588946/assessing-the-independent-and-combined-effects-of-subsidies-for-antimalarials-and-rapid-diagnostic-testing-on-fever-management-decisions-in-the-retail-sector-results-from-a-factorial-randomised-trial-in-western-kenya
#17
Wendy Prudhomme O'Meara, Manoj Mohanan, Jeremiah Laktabai, Adriane Lesser, Alyssa Platt, Elisa Maffioli, Elizabeth L Turner, Diana Menya
OBJECTIVES: There is an urgent need to understand how to improve targeting of artemisinin combination therapy (ACT) to patients with confirmed malaria infection, including subsidised ACTs sold over-the-counter. We hypothesised that offering an antimalarial subsidy conditional on a positive malaria rapid diagnostic test (RDT) would increase uptake of testing and improve rational use of ACTs. METHODS: We designed a 2×2 factorial randomised experiment evaluating 2 levels of subsidy for RDTs and ACTs...
August 2016: BMJ Global Health
https://www.readbyqxmd.com/read/28588574/predicting-rts-s-vaccine-mediated-protection-from-transcriptomes-in-a-malaria-challenge-clinical-trial
#18
Robert A van den Berg, Margherita Coccia, W Ripley Ballou, Kent E Kester, Christian F Ockenhouse, Johan Vekemans, Erik Jongert, Arnaud M Didierlaurent, Robbert G van der Most
The RTS,S candidate malaria vaccine can protect against controlled human malaria infection (CHMI), but how protection is achieved remains unclear. Here, we have analyzed longitudinal peripheral blood transcriptome and immunogenicity data from a clinical efficacy trial in which healthy adults received three RTS,S doses 4 weeks apart followed by CHMI 2 weeks later. Multiway partial least squares discriminant analysis (N-PLS-DA) of transcriptome data identified 110 genes that could be used in predictive models of protection...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28579627/carriage-of-sub-microscopic-sexual-and-asexual-plasmodium-falciparum-stages-in-the-dry-season-at-navrongo-ghana
#19
Geoffrey R Atelu, Nancy O Duah, Michael D Wilson
BACKGROUND: We investigated the prevalence of sub-microscopic Plasmodium falciparum infections and gametocyte carriage in asymptomatic individuals in Navrongo in northern Ghana, an area of seasonal malaria transmission. DESIGN: A cross sectional study of 209 randomly selected participants of all age-groups was conducted in February and March, 2015. METHODS: Capillary blood samples collected from these individuals were used for the detection of both asexual and gametocyte stage parasites by microscopy, reverse transcriptase polymerase chain reaction (RT-PCR) and conventional nested PCR methods...
December 2016: Ghana Medical Journal
https://www.readbyqxmd.com/read/28567280/solar-powered-oxygen-systems-in-remote-health-centers-in-papua-new-guinea-a-large-scale-implementation-effectiveness-trial
#20
Trevor Duke, Ilomo Hwaihwanje, Magdalynn Kaupa, Jonah Karubi, Doreen Panauwe, Martin Sa'avu, Francis Pulsan, Peter Prasad, Freddy Maru, Henry Tenambo, Ambrose Kwaramb, Eleanor Neal, Hamish Graham, Rasa Izadnegahdar
BACKGROUND: Pneumonia is the largest cause of child deaths in Papua New Guinea (PNG), and hypoxaemia is the major complication causing death in childhood pneumonia, and hypoxaemia is a major factor in deaths from many other common conditions, including bronchiolitis, asthma, sepsis, malaria, trauma, perinatal problems, and obstetric emergencies. A reliable source of oxygen therapy can reduce mortality from pneumonia by up to 35%. However, in low and middle income countries throughout the world, improved oxygen systems have not been implemented at large scale in remote, difficult to access health care settings, and oxygen is often unavailable at smaller rural hospitals or district health centers which serve as the first point of referral for childhood illnesses...
June 2017: Journal of Global Health
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