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https://www.readbyqxmd.com/read/28722601/rabies-in-myanmar-prevalent-preventable-but-not-prioritized
#1
Thet Thet Mu, Aye Aye Sein, Chit Soe, Nan Phyu Phyu Aung, Tint Tint Kyi, Josh Hanson
Despite the availability of proven measures to prevent the disease, rabies now kills more people in Myanmar than malaria. Although there are challenges in controlling rabies in such a large and culturally diverse country, Myanmar's successful National Malaria Control Program demonstrates what can be achieved with sufficient political, financial, and scientific commitment. Presently, however, Myanmar lacks a comparable program to coordinate the multifaceted approach that is necessary to control rabies. The national government has invested heavily in improving access to postexposure prophylaxis, but there should also be an emphasis on other, more cost-effective strategies, particularly mass canine vaccination, which has been an essential component of successful rabies elimination programs in other countries...
June 12, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28722588/optimizing-direct-membrane-and-direct-skin-feeding-assays-for-plasmodium-falciparum-transmission-blocking-vaccine-trials-in-bancoumana-mali
#2
Mamadou B Coulibaly, Erin E Gabriel, Youssouf Sinaba, Daman Sylla, Adama Sacko, Lakamy Sylla, Boubacar Coulibaly, Jen C C Hume, Ibrahima Baber, Mahamadoun H Assadou, Issaka Sagara, Yimin Wu, Sara A Healy, Ogobara Doumbo, Sekou F Traore, Patrick E Duffy
Malaria transmission-blocking vaccines (TBV) have been evaluated in field trials in Mali, since 2013. However, the assays currently used to measure serum antibody TB activity (TBA) after vaccination are highly variable, in part due to the lack of optimization and standardization for field assays in which mosquitoes feed on gametocytemic blood. Herein, we report a study conducted in Bancoumana village, Mali, where we identify and optimize the parameters that contribute to successful mosquito feeding outcomes in both direct skin feeds (DSFs) and direct membrane feeding assays (DMFA)...
June 26, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28719950/isolation-and-characterization-of-vaccine-candidate-genes-including-csp-and-msp1-in-plasmodium-yoelii
#3
Seon-Hee Kim, Young-An Bae, Ju-Young Seoh, Hyun-Jong Yang
Malaria is an infectious disease affecting humans, which is transmitted by the bite of Anopheles mosquitoes harboring sporozoites of parasitic protozoans belonging to the genus Plasmodium. Despite past achievements to control the protozoan disease, malaria still remains a significant health threat up to now. In this study, we cloned and characterized the full-unit Plasmodium yoelii genes encoding merozoite surface protein 1 (MSP1), circumsporozoite protein (CSP), and Duffy-binding protein (DBP), each of which can be applied for investigations to obtain potent protective vaccines in the rodent malaria model, due to their specific expression patterns during the parasite life cycle...
June 2017: Korean Journal of Parasitology
https://www.readbyqxmd.com/read/28719292/malaria-infection-and-gametocyte-carriage-rates-in-preparation-for-transmission-blocking-vaccine-trials-in-bancoumana-mali
#4
Mahamadoun Hamady Assadou, Issaka Sagara, Sara A Healy, Merepen Agnes Guindo, Mamady Kone, Sintry Sanogo, M'Bouye Doucoure, Sekouba Keita, Ruth D Ellis, Yimin Wu, Freda Omaswa, Patrick E Duffy, Ogobara K Doumbo
The epidemiological characterization of transmission reservoirs is a critical step in preparation for interventional trials for malaria elimination/eradication. Using cluster sampling and households/compounds as units of sampling, we recruited and followed monthly, from June 2011 to June 2012, 250 volunteers 3 months to 50 years of age in Bancoumana, Mali. In July 2012, only participants 5-35 years of age (N = 121) were reenrolled and followed for an additional year. Malaria infection prevalence was highest in October in both 2011 (21...
July 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28716086/dynamics-in-multiplicity-of-plasmodium-falciparum-infection-among-children-with-asymptomatic-malaria-in-central-ghana
#5
Akua Kyerewaa Botwe, Kwaku Poku Asante, George Adjei, Samuel Assafuah, David Dosoo, Seth Owusu-Agyei
BACKGROUND: The determinants of malaria parasite virulence is not entirely known, but the outcome of malaria infection (asymptomatic or symptomatic) has been associated with carriage of distinct parasite genotypes. Alleles considered important for erythrocyte invasion and selected as candidate targets for malaria vaccine development are increasingly being shown to have distinct characteristics in infection outcomes. Any unique/distinct patterns or alleles linked to infection outcome should be reproducible for a given malaria-cohort regardless of location, time or intervention...
July 17, 2017: BMC Genetics
https://www.readbyqxmd.com/read/28708996/functional-profiling-of-a-plasmodium-genome-reveals-an-abundance-of-essential-genes
#6
Ellen Bushell, Ana Rita Gomes, Theo Sanderson, Burcu Anar, Gareth Girling, Colin Herd, Tom Metcalf, Katarzyna Modrzynska, Frank Schwach, Rowena E Martin, Michael W Mather, Geoffrey I McFadden, Leopold Parts, Gavin G Rutledge, Akhil B Vaidya, Kai Wengelnik, Julian C Rayner, Oliver Billker
The genomes of malaria parasites contain many genes of unknown function. To assist drug development through the identification of essential genes and pathways, we have measured competitive growth rates in mice of 2,578 barcoded Plasmodium berghei knockout mutants, representing >50% of the genome, and created a phenotype database. At a single stage of its complex life cycle, P. berghei requires two-thirds of genes for optimal growth, the highest proportion reported from any organism and a probable consequence of functional optimization necessitated by genomic reductions during the evolution of parasitism...
July 13, 2017: Cell
https://www.readbyqxmd.com/read/28702028/immunization-with-the-malaria-diversity-covering-blood-stage-vaccine-candidate-plasmodium-falciparum-apical-membrane-antigen-1-dico-in-complex-with-its-natural-ligand-pfron2-does-not-improve-the-in-vitro-efficacy
#7
Holger Spiegel, Alexander Boes, Rolf Fendel, Andreas Reimann, Stefan Schillberg, Rainer Fischer
The blood-stage malaria vaccine candidate Plasmodium falciparum apical membrane antigen 1 (PfAMA1) can induce strong parasite growth-inhibitory antibody responses in animals but has not achieved the anticipated efficacy in clinical trials. Possible explanations in humans are the insufficient potency of the elicited antibody responses, as well as the high degree of sequence polymorphisms found in the field. Several strategies have been developed to improve the cross-strain coverage of PfAMA1-based vaccines, whereas innovative concepts to increase the potency of PfAMA1-specific IgG responses have received little attention even though this may be an essential requirement for protective efficacy...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28699823/the-gmz2-malaria-vaccine-from-concept-to-efficacy-in-humans
#8
Michael Theisen, Bright Adu, Benjamin Mordmüller, Subhash Singh
GMZ2 is a recombinant protein consisting of conserved domains of GLURP and MSP3, two asexual blood-stage antigens of Plasmodium falciparum, and is designed with the aim of mimicking naturally acquired anti-malarial immunity. The rationale for combining these two antigens is based on a series of immune epidemiological studies from geographically diverse malaria endemic regions; functional in vitro studies; and pre-clinical studies in rodents and New World monkeys. GMZ2 adjuvanted with alhydrogel® (alum) was well tolerated and immunogenic in three phase 1 studies...
July 12, 2017: Expert Review of Vaccines
https://www.readbyqxmd.com/read/28698275/crispr-cas9-genome-editing-reveals-that-the-intron-is-not-essential-for-var2csa-gene-activation-or-silencing-in-plasmodium-falciparum
#9
Jessica M Bryant, Clément Regnault, Christine Scheidig-Benatar, Sebastian Baumgarten, Julien Guizetti, Artur Scherf
Plasmodium falciparum relies on monoallelic expression of 1 of 60 var virulence genes for antigenic variation and host immune evasion. Each var gene contains a conserved intron which has been implicated in previous studies in both activation and repression of transcription via several epigenetic mechanisms, including interaction with the var promoter, production of long noncoding RNAs (lncRNAs), and localization to repressive perinuclear sites. However, functional studies have relied primarily on artificial expression constructs...
July 11, 2017: MBio
https://www.readbyqxmd.com/read/28698207/strict-tropism-for-cd71-cd234-human-reticulocytes-limits-plasmodium-cynomolgi-s-zoonotic-potential
#10
Varakorn Kosaisavee, Rossarin Suwanarusk, Adeline C Y Chua, Dennis E Kyle, Benoit Malleret, Rou Zhang, Mallika Imwong, Rawiwan Imerbsin, Ratawan Ubalee, Hugo Sámano-Sánchez, Bryan K S Yeung, Jessica Ong, Eric Lombardini, François Nosten, Kevin S W Tan, Pablo Bifani, Georges Snounou, Laurent Rénia, Bruce Russell
Two malaria parasites of Southeast Asian macaques, Plasmodium knowlesi and P. cynomolgi, can infect humans experimentally. In Malaysia, where both species are common, zoonotic knowlesi malaria has recently become dominant, and cases are recorded throughout the region. By contrast, to date only a single case of naturally acquired P. cynomolgi has been found in humans. In this study we show that whereas P. cynomolgi merozoites invade monkey red blood cells (RBCs) indiscriminately in vitro, for humans they are restricted to reticulocytes expressing both transferrin receptor 1 (Trf1 or CD71) and the Duffy antigen/chemokine receptor (DARC or CD234)...
July 11, 2017: Blood
https://www.readbyqxmd.com/read/28692655/population-based-incidence-seasonality-and-serotype-distribution-of-invasive-salmonellosis-among-children-in-nanoro-rural-burkina-faso
#11
Issa Guiraud, Annelies Post, Seydou Nakanabo Diallo, Palpouguini Lompo, Jessica Maltha, Kamala Thriemer, Christian Marc Tahita, Benedikt Ley, Karim Derra, Emmanuel Bottieau, Adama Kazienga, Céline Schurmans, Raffaella Ravinetto, Eli Rouamba, Johan Van Griensven, Sophie Bertrand, Halidou Tinto, Jan Jacobs
BACKGROUND: Bloodstream infections (BSI) caused by Salmonella Typhi and invasive non-Typhoidal Salmonella (iNTS) frequently affect children living in rural sub-Saharan Africa but data about incidence and serotype distribution are rare. OBJECTIVE: The present study assessed the population-based incidence of Salmonella BSI and severe malaria in a Health and Demographic Surveillance System in a rural area with seasonal malaria transmission in Nanoro, Burkina Faso. METHODS: Children between 2 months-15 years old with severe febrile illness were enrolled during a one-year surveillance period (May 2013-May 2014)...
2017: PloS One
https://www.readbyqxmd.com/read/28681555/the-structure-of-plasmodium-falciparum-3d7_0606800-reveals-a-bi-lobed-architecture-that-supports-re-annotation-as-a-venus-flytrap-protein
#12
Michelle L Parker, Raghavendran Ramaswamy, Kyle van Gordon, Cameron Powell, Jürgen Bosch, Martin J Boulanger
Plasmodium falciparum, the causative agent of malaria, employs a diverse array of surface displayed proteins to promote dissemination and establish infection in the human host. Of these, Pf3D7_0606800 is highly immunogenic and has been designated a potential top 10 candidate for inclusion in a multicomponent malarial vaccine. The role of Pf3D7_0606800 in parasite biology, however, is unknown and its characterization has been complicated by a lack of sequence identity with proteins of known structure or function...
July 6, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28680086/host-age-and-expression-of-genes-involved-in-red-blood-cell-invasion-in-plasmodium-falciparum-field-isolates
#13
Aida Valmaseda, Quique Bassat, Pedro Aide, Pau Cisteró, Alfons Jiménez, Aina Casellas, Sonia Machevo, Ruth Aguilar, Betuel Sigaúque, Virander S Chauhan, Christine Langer, James Beeson, Chetan Chitnis, Pedro L Alonso, Deepak Gaur, Alfredo Mayor
Plasmodium falciparum proteins involved in erythrocyte invasion are main targets of acquired immunity and important vaccine candidates. We hypothesized that anti-parasite immunity acquired upon exposure would limit invasion-related gene (IRG) expression and affect the clinical impact of the infection. 11 IRG transcript levels were measured in P. falciparum isolates by RT-PCR, and IgG/IgM against invasion ligands by Luminex®, in 50 Mozambican adults, 25 children with severe malaria (SM) and 25 with uncomplicated malaria (UM)...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28679447/in-vitro-inhibition-and-reversal-of-plasmodium-falciparum-cytoadherence-to-endothelium-by-monoclonal-antibodies-to-icam-1-and-cd36
#14
Khairul M F Mustaffa, Janet Storm, Megan Whittaker, Tadge Szestak, Alister G Craig
BACKGROUND: Sequestration of parasitized red blood cells from the peripheral circulation during an infection with Plasmodium falciparum is caused by an interaction between the parasite protein PfEMP1 and receptors on the surface of host endothelial cells, known as cytoadherence. Several lines of evidence point to a link between the pathology of severe malaria and cytoadherence, therefore blocking adhesion receptors involved in this process could be a good target to inhibit pRBC sequestration and prevent disease...
July 5, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28673287/new-gorilla-adenovirus-vaccine-vectors-induce-potent-immune-responses-and-protection-in-a-mouse-malaria-model
#15
Keith Limbach, Maureen Stefaniak, Ping Chen, Noelle B Patterson, Grant Liao, Shaojie Weng, Svetlana Krepkiy, Greg Ekberg, Holly Torano, Damodar Ettyreddy, Kalpana Gowda, Sharvari Sonawane, Arnel Belmonte, Esteban Abot, Martha Sedegah, Michael R Hollingdale, Ann Moormann, John Vulule, Eileen Villasante, Thomas L Richie, Douglas E Brough, Joseph T Bruder
BACKGROUND: A DNA-human Ad5 (HuAd5) prime-boost malaria vaccine has been shown to protect volunteers against a controlled human malaria infection. The potency of this vaccine, however, appeared to be affected by the presence of pre-existing immunity against the HuAd5 vector. Since HuAd5 seroprevalence is very high in malaria-endemic areas of the world, HuAd5 may not be the most appropriate malaria vaccine vector. This report describes the evaluation of the seroprevalence, immunogenicity and efficacy of three newly identified gorilla adenoviruses, GC44, GC45 and GC46, as potential malaria vaccine vectors...
July 3, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28669593/pathogen-mimicking-vaccine-delivery-system-designed-with-a-bioactive-polymer-inulin-acetate-for-robust-humoral-and-cellular-immune-responses
#16
Hemachand Tummala, Sunny Kumar, Siddharth S Kesharwani, Bhimanna Kuppast, Mohammed Ali Bakkari
New and improved vaccines are needed against challenging diseases such as malaria, tuberculosis, Ebola, influenza, AIDS, and cancer. The majority of existing vaccine adjuvants lack the ability to significantly stimulate the cellular immune response, which is required to prevent the aforementioned diseases. This study designed a novel particulate based pathogen-mimicking vaccine delivery system (PMVDS) to target antigen-presenting-cells (APCs) such as dendritic cells. The uniqueness of PMVDS is that the polymer used to prepare the delivery system, Inulin Acetate (InAc), activates the innate immune system...
June 29, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28668325/igg-opsonization-of-merozoites-multiple-immune-mechanisms-for-malaria-vaccine-development
#17
REVIEW
Danika L Hill, Louis Schofield, Danny W Wilson
Global eradication of the human-infecting malaria parasite Plasmodium falciparum, the major cause of malaria mortality, is unlikely to be achieved without an effective vaccine. However, our limited understanding of how protective immune responses target malaria parasites in humans, and how to best elicit these immune responses through vaccination, has hampered vaccine development. The red blood cell invading stage of the parasite lifecycle (merozoite) displays antigens that are attractive vaccine candidates as they are accessible to antibodies and raise high antibody titres in naturally immune individuals...
June 29, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28662722/yeast-lysates-carrying-the-nucleoprotein-from-measles-virus-vaccine-as-a-novel-subunit-vaccine-platform-to-deliver-plasmodium-circumsporozoite-antigen
#18
Daria Jacob, Claude Ruffie, Chantal Combredet, Pauline Formaglio, Rogerio Amino, Robert Ménard, Frédéric Tangy, Monica Sala
BACKGROUND: Yeast cells represent an established bioreactor to produce recombinant proteins for subunit vaccine development. In addition, delivery of vaccine antigens directly within heat-inactivated yeast cells is attractive due to the adjuvancy provided by the yeast cell. In this study, Pichia pastoris yeast lysates carrying the nucleoprotein (N) from the measles vaccine virus were evaluated as a novel subunit vaccine platform to deliver the circumsporozoite surface antigen (CS) of Plasmodium...
June 29, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28660174/parasite-carbohydrate-vaccines
#19
REVIEW
Jonnel A Jaurigue, Peter H Seeberger
Vaccination is an efficient means of combating infectious disease burden globally. However, routine vaccines for the world's major human parasitic diseases do not yet exist. Vaccines based on carbohydrate antigens are a viable option for parasite vaccine development, given the proven success of carbohydrate vaccines to combat bacterial infections. We will review the key components of carbohydrate vaccines that have remained largely consistent since their inception, and the success of bacterial carbohydrate vaccines...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28655825/a-plastid-protein-that-evolved-from-ubiquitin-and-is-required-for-apicoplast-protein-import-in-toxoplasma-gondii
#20
Justin D Fellows, Michael J Cipriano, Swati Agrawal, Boris Striepen
Apicomplexan parasites cause a variety of important infectious diseases, including malaria, toxoplasma encephalitis, and severe diarrhea due to Cryptosporidium Most apicomplexans depend on an organelle called the apicoplast which is derived from a red algal endosymbiont. The apicoplast is essential for the parasite as the compartment of fatty acid, heme, and isoprenoid biosynthesis. The majority of the approximate 500 apicoplast proteins are nucleus encoded and have to be imported across the four membranes that surround the apicoplast...
June 27, 2017: MBio
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