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https://www.readbyqxmd.com/read/28822205/comparison-of-effectiveness-of-two-different-artemisinin-based-combination-therapies-in-an-area-with-high-seasonal-transmission-of-malaria-in-burkina-faso
#1
Paul Sondo, Karim Derra, Seydou Diallo Nakanabo, Zekiba Tarnagda, Adama Kazienga, Innocent Valea, Herman Sorgho, Jean-Bosco Ouédraogo, Tinga Robert Guiguemdé, Halidou Tinto
In Sahelian countries such as Burkina Faso, malaria transmission is seasonal with a high incidence of transmission during the rainy season. This study aimed to compare the effectiveness of the two recommended treatments (Artemether-Lumefantrine and Artesunate-Amodiaquine) for uncomplicated malaria in Burkina Faso regarding this seasonal variation of malaria transmission. This is part of a randomized open label trial comparing the effectiveness and safety of Artemether-Lumefantrine versus Artesunate-Amodiaquine according to routine practice in Nanoro...
2017: Annals of Parasitology
https://www.readbyqxmd.com/read/28821806/longitudinal-study-of-changes-in-%C3%AE-%C3%AE-t-cells-and-cd4-t-cells-upon-asymptomatic-malaria-infection-in-indonesian-children
#2
Sanne E de Jong, Vera E R Asscher, Linda J Wammes, Aprilianto E Wiria, Firdaus Hamid, Erliyani Sartono, Taniawati Supali, Hermelijn H Smits, Adrian J F Luty, Maria Yazdanbakhsh
Both γδ T cells and CD4(+) T cells have been implicated in immunity to malaria, but their association with natural gain or loss of infection has not been studied before. Therefore, we followed up asymptomatic children living in an area endemic for malaria in Indonesia for 21 months. The percentage of γδ T cells was related to both current and previous infection, with higher percentages in infected than uninfected children and declining after infections resolve. Infected children also had higher levels of Th1 and Th17 cells, lower levels of CD25(Hi) FOXP3(+) regulatory T cells (Tregs), but similar levels of Th2 cells as compared to uninfected children...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28820883/spatial-clustering-of-patent-and-sub-patent-malaria-infections-in-northern-namibia-implications-for-surveillance-and-response-strategies-for-elimination
#3
Jennifer L Smith, Joyce Auala, Munyaradzi Tambo, Erastus Haindongo, Stark Katokele, Petrina Uusiku, Roly Gosling, Immo Kleinschmidt, Davis Mumbengegwi, Hugh J W Sturrock
BACKGROUND: Reactive case detection (RACD) around passively detected malaria cases is a strategy to identify and treat hotspots of malaria transmission. This study investigated the unproven assumption on which this approach is based, that in low transmission settings, infections cluster over small scales. METHODS: A prospective case-control study was conducted between January 2013 and August 2014 in Ohangwena and Omusati regions in north central Namibia. Patients attending health facilities who tested positive by malaria rapid diagnostic test (RDT) (index cases) were traced back to their home...
2017: PloS One
https://www.readbyqxmd.com/read/28820722/house-structure-is-associated-with-plasmodium-falciparum-infection-in-a-low-transmission-setting-in-southern-zambia
#4
Matthew M Ippolito, Kelly M Searle, Harry Hamapumbu, Timothy M Shields, Jennifer C Stevenson, Philip E Thuma, William J Moss, For The Southern Africa International Center Of Excellence For Malaria Research
House structure may influence the risk of malaria by affecting mosquito entry and indoor resting. Identification of construction features associated with protective benefits could inform vector control approaches, even in low-transmission settings. We examined the association between house structure and malaria prevalence in a cross-sectional analysis of 2,788 children and adults residing in 866 houses in a low-transmission area of Southern Province, Zambia, over the period 2008-2012. Houses were categorized according to wall (brick/cement block or mud/grass) and roof (metal or grass) material...
August 7, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28820713/quality-testing-of-artemisinin-based-antimalarial-drugs-in-myanmar
#5
Suqin Guo, Myat Phone Kyaw, Lishan He, Myo Min, Xiangxue Ning, Wei Zhang, Baomin Wang, Liwang Cui
Artemisinin-based combination therapies are the frontline treatment of Plasmodium falciparum malaria. The circulation of falsified and substandard artemisinin-based antimalarials in Southeast Asia has been a major predicament for the malaria elimination campaign. To provide an update of this situation, we purchased 153 artemisinin-containing antimalarials, as convenience samples, in private drug stores from different regions of Myanmar. The quality of these drugs in terms of their artemisinin derivative content was tested using specific dipsticks for these artemisinin derivatives, as point-of-care devices...
July 31, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28820709/performance-of-a-high-sensitivity-rapid-diagnostic-test-for-plasmodium-falciparum-malaria-in-asymptomatic-individuals-from-uganda-and-myanmar-and-naive-human-challenge-infections
#6
Smita Das, Ihn Kyung Jang, Becky Barney, Roger Peck, John C Rek, Emmanuel Arinaitwe, Harriet Adrama, Maxwell Murphy, Mallika Imwong, Clare L Ling, Stephane Proux, Warat Haohankhunnatham, Melissa Rist, Annette M Seilie, Amelia Hanron, Glenda Daza, Ming Chang, Tomoka Nakamura, Michael Kalnoky, Paul Labarre, Sean C Murphy, James S McCarthy, Francois Nosten, Bryan Greenhouse, Sophie Allauzen, Gonzalo J Domingo
Sensitive field-deployable diagnostic tests can assist malaria programs in achieving elimination. The performance of a new Alere™ Malaria Ag P.f Ultra Sensitive rapid diagnostic test (uRDT) was compared with the currently available SD Bioline Malaria Ag P.f RDT in blood specimens from asymptomatic individuals in Nagongera, Uganda, and in a Karen Village, Myanmar, representative of high- and low-transmission areas, respectively, as well as in pretreatment specimens from study participants from four Plasmodium falciparum-induced blood-stage malaria (IBSM) studies...
August 7, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28820683/malaria-in-the-guangxi-zhuang-autonomous-region-in-china-a-twelve-year-surveillance-data-study
#7
Kangming Lin, Haiyan Wei, Weikang Jiang, Jun Li, Weiwei Zhang, Shujiao Wei, Yichao Yang, Yaming Huang, Xiangyang Feng, Hong Tu, Jun Feng
The incidence of an indigenous malaria, defined as malaria acquired by a local mosquito transmission, declined from 2004 to 2015 in the Guangxi Zhuang Autonomous Region. However, imported malaria, defined as malaria acquired from other endemic regions outside of China, has been increasing in the region, as in the rest of the country, particularly the disease caused by Plasmodium falciparum. A retrospective study was conducted to explore malaria-endemic characteristics in Guangxi during the 2004-2015 timeframe; a total of 2,726 confirmed malaria cases were reported, and the majority (90...
August 7, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28820682/case-report-a-case-of-plasmodium-falciparum-hrp2-and-hrp3-gene-mutation-in-bangladesh
#8
Maisha Khair Nima, Thomas Hougard, Mohammad Enayet Hossain, Mohammad Golam Kibria, Abu Naser Mohon, Fatema Tuj Johora, Rajibur Rahman, Rashidul Haque, Mohammad Shafiul Alam
Several species of Plasmodium are responsible for causing malaria in humans. Proper diagnoses are crucial to case management, because severity and treatment varies between species. Diagnoses can be made using rapid diagnostic tests (RDTs), which detect Plasmodium proteins. Plasmodium falciparum causes the most virulent cases of malaria, and P. falciparum histidine-rich protein 2 (PfHRP2) is a common target of falciparum malaria RDTs. Here we report a case in which a falciparum malaria patient in Bangladesh tested negative on PfHRP2-based RDTs...
August 7, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28819735/-evaluation-of-the-onsite-malaria-rapid-test-performance-in-miandrivazo-madagascar
#9
E Ravaoarisoa, T Andriamiandranoro, R Raherinjafy, M Jahevitra, S Razanatsiorimalala, V Andrianaranjaka, M Randrianarivelojosia
The performance of the malaria rapid diagnostic test OnSite-for detecting pan specific pLDH and Plasmodium falciparum specific HRP2 - was assessed during the malaria transmission peak period in Miandrivazo, in the southwestern part of Madagascar from April 20 to May 6, 2010. At the laboratory, the quality control OnSite Malaria Rapid Test according to the WHO/TDR/FIND method demonstrated that the test had good sensitivity. Of the 218 OnSite tests performed at the Miandrivazo Primary Health Center on patients with fever or a recent history of fever, four (1...
August 17, 2017: Bulletin de la Société de Pathologie Exotique
https://www.readbyqxmd.com/read/28819256/fbn30-in-wild%C3%A2-anopheles-gambiae-functions-as-a-pathogen-recognition-molecule-against-clinically-circulating-plasmodium-falciparum-in-malaria-endemic-areas-in-kenya
#10
Guodong Niu, Genwei Zhang, Caio Franca, Yingjun Cui, Stephen Munga, Yaw Afrane, Jun Li
Malaria is a worldwide health problem that affects two-thirds of the world population. Plasmodium invasion of anopheline mosquitoes is an obligatory step for malaria transmission. However, mosquito-malaria molecular interactions in nature are not clear. A genetic variation within mosquito fibrinogen related-protein 30 (FBN30) was previously identified to be associated with Plasmodium falciparum infection in natural Anopheles gambiae populations at malaria endemic areas in Kenya, and reducing FBN30 expression by RNAi makes mosquitoes more susceptible to P...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818675/presence-of-quintuple-dhfr-n51-c59-s108-dhps-a437-k540-mutations-in-plasmodium-falciparum-isolates-from-pregnant-women-and-the-general-population-in-nanoro-burkina-faso
#11
Esmée Ruizendaal, Marc C Tahita, Maminata Traoré, Halidou Tinto, Henk D F H Schallig, Petra F Mens
Sulphadoxine-pyrimethamine (SP) is only used for intermittent preventive treatment during pregnancy (IPTp) in most Sub-Saharan African countries. However, there are concerns about the efficacy of IPTp-SP because of increasing resistance. Combinations of point mutations in the dhps and dhfr genes of Plasmodium falciparum are associated with SP resistance, in particular the quintuple dhfr (N51, C59, S108) - dhps (codons A437, K540) mutant. In Nanoro, Burkina Faso, filter paper samples from pregnant women at first antenatal care visit and at delivery plus samples from the general population (GP) were studied for dhfr and dhps mutations by sequencing...
August 14, 2017: Molecular and Biochemical Parasitology
https://www.readbyqxmd.com/read/28818101/a-new-method-for-sequencing-the-hypervariable-plasmodium-falciparum-gene-var2csa-from-clinical-samples
#12
Antoine Dara, Mark A Travassos, Matthew Adams, Sarah Schaffer DeRoo, Elliott F Drábek, Sonia Agrawal, Miriam K Laufer, Christopher V Plowe, Joana C Silva
BACKGROUND: VAR2CSA, a member of the Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) family, mediates the binding of P. falciparum-infected erythrocytes to chondroitin sulfate A, a surface-associated molecule expressed in placental cells, and plays a central role in the pathogenesis of placental malaria. VAR2CSA is a target of naturally acquired immunity and, as such, is a leading vaccine candidate against placental malaria. This protein is very polymorphic and technically challenging to sequence...
August 17, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28818084/do-the-venous-blood-samples-replicate-malaria-parasite-densities-found-in-capillary-blood-a-field-study-performed-in-naturally-infected-asymptomatic-children-in-cameroon
#13
Maurice M Sandeu, Albert N Bayibéki, Majoline T Tchioffo, Luc Abate, Geoffrey Gimonneau, Parfait H Awono-Ambéné, Sandrine E Nsango, Diadier Diallo, Antoine Berry, Gaétan Texier, Isabelle Morlais
BACKGROUND: The measure of new drug- or vaccine-based approaches for malaria control is based on direct membrane feeding assays (DMFAs) where gametocyte-infected blood samples are offered to mosquitoes through an artificial feeder system. Gametocyte donors are identified by the microscopic detection and quantification of malaria blood stages on blood films prepared using either capillary or venous blood. However, parasites are known to sequester in the microvasculature and this phenomenon may alter accurate detection of parasites in blood films...
August 17, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28818049/post-treatment-haemolysis-in-african-children-with-hyperparasitaemic-falciparum-malaria-a-randomized-comparison-of-artesunate-and-quinine
#14
C Fanello, M Onyamboko, S J Lee, C Woodrow, S Setaphan, K Chotivanich, P Buffet, S Jauréguiberry, K Rockett, K Stepniewska, N P J Day, N J White, A M Dondorp
BACKGROUND: Parenteral artesunate is the treatment of choice for severe malaria. Recently, haemolytic anaemia occurring 1 to 3 weeks after artesunate treatment of falciparum malaria has been reported in returning travellers in temperate countries. METHODS: To assess these potential safety concerns in African children, in whom most deaths from malaria occur, an open-labelled, randomized controlled trial was conducted in Kinshasa, Democratic Republic of Congo. 217 children aged between 6 months and 14 years with acute uncomplicated falciparum malaria and parasite densities over 100,000/μL were randomly allocated to intravenous artesunate or quinine, hospitalized for 3 days and then followed for 42 days...
August 17, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28817634/cross-reactivity-between-apical-membrane-antgen-1-and-rhoptry-neck-protein-2-in-p-vivax-and-p-falciparum-a-structural-and-binding-study
#15
Brigitte Vulliez-Le Normand, Frederick A Saul, Sylviane Hoos, Bart W Faber, Graham A Bentley
Malaria, a disease endemic in many tropical and subtropical regions, is caused by infection of the erythrocyte by the apicomplexan parasite Plasmodium. Host-cell invasion is a complex process but two Plasmodium proteins, Apical Membrane Antigen 1 (AMA1) and the Rhoptry Neck protein complex (RON), play a key role. AMA1, present on the surface of the parasite, binds tightly to the RON2 component of the RON protein complex, which is inserted into the erythrocyte membrane during invasion. Blocking the AMA1-RON2 interaction with antibodies or peptides inhibits invasion, underlining its importance in the Plasmodium life cycle and as a target for therapeutic strategies...
2017: PloS One
https://www.readbyqxmd.com/read/28817228/isolation-of-the-new-antiplasmodial-butanolide-malleastrumolide-a-from-a-malleastrum-sp-meliaceae-from-madagascar
#16
Yongle Du, Alexander K Abedi, Ana Lisa Valenciano, Maria L Fernández-Murga, Maria B Cassera, Vincent E Rasamison, Wendy L Applequist, James S Miller, David G I Kingston
An extract of a Malleastrum sp. (Meliaceae) collected in Madagascar by the Madagascar International Cooperative Biodiversity Group was found to have antimalarial activity, with an IC50 value between 2.5 and 5 μg/mL. After purification by liquid-liquid partition, chromatography on a Diaion open column, C-18 SPE and C-18 reverse phase HPLC, the new butanolide malleastrumolide A was isolated. The structure of malleastrumolide A was determined by mass spectrometry, NMR and ECD. The double bond position was determined by cross-metathesis and mass spectrometry...
August 17, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28815215/structural-characterization-of-acidic-m17-leucine-aminopeptidases-from-the-tritryps-and-evaluation-of-their-role-in-nutrient-starvation-in-trypanosoma-brucei
#17
Jennifer Timm, Maria Valente, Daniel García-Caballero, Keith S Wilson, Dolores González-Pacanowska
Leucine aminopeptidase (LAP) is found in all kingdoms of life and catalyzes the metal-dependent hydrolysis of the N-terminal amino acid residue of peptide or amino acyl substrates. LAPs have been shown to participate in the N-terminal processing of certain proteins in mammalian cells and in homologous recombination and transcription regulation in bacteria, while in parasites, they are involved in host cell invasion and provision of essential amino acids for growth. The enzyme is essential for survival in Plasmodium falciparum, where its drug target potential has been suggested...
July 2017: MSphere
https://www.readbyqxmd.com/read/28814310/modelling-the-benefits-of-long-acting-or-transmission-blocking-drugs-for-reducing-plasmodium-falciparum-transmission-by-case-management-or-by-mass-treatment
#18
Michael T Bretscher, Jamie T Griffin, Azra C Ghani, Lucy C Okell
BACKGROUND: Anti-malarial drugs are an important tool for malaria control and elimination. Alongside their direct benefit in the treatment of disease, drug use has a community-level effect, clearing the reservoir of infection and reducing onward transmission of the parasite. Different compounds potentially have different impacts on transmission-with some providing periods of prolonged chemoprophylaxis whilst others have greater transmission-blocking potential. The aim was to quantify the relative benefit of such properties for transmission reduction to inform target product profiles in the drug development process and choice of first-line anti-malarial treatment in different endemic settings...
August 16, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28813147/synthesis-and-evaluation-of-asymmetric-acyclic-nucleoside-bisphosphonates-as-inhibitors-of-plasmodium-falciparum-and-human-hypoxanthine-guanine-xanthine-phosphoribosyltransferase
#19
Petr Špaček, Dianne T Keough, Marina Chavchich, Martin Dracinsky, Zlatko Janeba, Lieve Naesens, Michael D Edstein, Luke W Guddat, Dana Hocková
Acyclic nucleoside bisphosphonates (ANbPs) have previously been shown to be good inhibitors of human hypoxanthine-guanine phosphoribosyltransferase (HGPRT) and Plasmodium falciparum (Pf) hypoxanthine-guanine-xanthine phosphoribosyltransferase (PfHGXPRT). Based on this scaffold, a new series of ANbPs was synthesized. One of these new ANbPs, [3-(guanine-9-yl)-2-((2-phosphonoethoxy)methyl)propoxy]methylphosphonic acid, exhibited Ki values of 6 and 70 nM for human HGPRT and Pf HGXPRT, respectively. These low Ki values were achieved by inserting an extra carbon atom in the linker connecting the N9 atom of guanine to one of the phosphonate groups...
August 16, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28812552/competition-along-trajectories-governs-adaptation-rates-towards-antimicrobial-resistance
#20
C Brandon Ogbunugafor, Margaret J Eppstein
The increasing availability of genotype-phenotype maps for different combinations of mutations has empowered evolutionary biologists with the tools to interrogate the predictability of adaptive evolution, especially in the context of the evolution of antimicrobial resistance. Large microbial populations are known to generate competing beneficial mutations, but determining how these mutations contribute to the adaptive trajectories that are most likely to be followed remains a challenge. Despite a recognition that there may also be competition between successive alleles on the same trajectory, prior studies have not fully considered how this impacts adaptation rates along, or likelihood of following, individual trajectories...
November 21, 2016: Nature ecology & evolution
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