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https://www.readbyqxmd.com/read/29342212/sequence-variation-in-plasmodium-falciparum-merozoite-surface-protein-2-is-associated-with-virulence-causing-severe-and-cerebral-malaria
#1
Suwanna Chaorattanakawee, Pornlada Nuchnoi, Hathairad Hananantachai, Uranan Tumkosit, David Saunders, Izumi Naka, Jun Ohashi, Jintana Patarapotikul
Parasite virulence, an important factor contributing to the severity of Plasmodium falciparum infection, varies among P. falciparum strains. Relatively little is known regarding markers of virulence capable of identifying strains responsible for severe malaria. We investigated the effects of genetic variations in the P.f. merozoite surface protein 2 gene (msp2) on virulence, as it was previously postulated as a factor. We analyzed 300 msp2 sequences of single P. falciparum clone infection from patients with uncomplicated disease as well as those admitted for severe malaria with and without cerebral disease...
2018: PloS One
https://www.readbyqxmd.com/read/29340263/diagnostic-delay-for-imported-malaria-a-case-of-plasmodium-falciparum-malaria-misdiagnosed-as-common-cold
#2
Ryota Hase
A 37-year-old Japanese man experienced fever and headache 8 days after returning to Japan following a 6-month stay in Nigeria. He visited two clinics but was sent home from each with a diagnosis of common cold. He was eventually brought to the emergency department with an altered mental status. Severe P. falciparum malaria was confirmed; his initial parasitemia index was 5.4%. He recovered fully with antimalarial treatment. This case suggests that primary care physicians should obtain recent travel history and consider malaria for any febrile patient who has returned from a malaria-endemic area...
January 2018: Journal of General and Family Medicine
https://www.readbyqxmd.com/read/29338760/increased-plasmodium-chabaudi-malaria-mortality-in-mice-with-nutritional-iron-deficiency-can-be-reduced-by-short-term-adjunctive-iron-supplementation
#3
Filip C Castberg, Lasse Maretty, Trine Staalsoe, Casper Hempel, Erik Clasen-Linde, Lars Hviid, Jørgen A L Kurtzhals
BACKGROUND: Iron deficiency is the most widespread nutrient deficiency and an important cause of developmental impairment in children. However, some studies have indicated that iron deficiency can also protect against malaria, which is a leading cause of childhood morbidity and mortality in large parts of the world. This has rendered interventions against iron deficiency in malaria-endemic areas controversial. METHODS: The effect of nutritional iron deficiency on the clinical outcome of Plasmodium chabaudi AS infection in A/J mice and the impact of intravenous iron supplementation with ferric carboxymaltose were studied before and after parasite infection...
January 16, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29338726/a-case-of-blackwater-fever-with-persistent-plasmodium-falciparum-parasitaemia-detected-by-pcr-after-artemether-lumefantrine-treatment
#4
Paul John Huggan, Chin Hin Ng, Jennifer Ho, Raymond Tzer Pin Valentine Lin, Jean-Marc Chavatte
BACKGROUND: Blackwater fever is a complication of malaria infection consisting of a syndrome of febrile intra-vascular haemolysis with severe anaemia and intermittent passage of dark-red to black colour urine. Despite numerous reports and studies of this condition, its pathogenesis remains incompletely understood. CASE PRESENTATION: This report describes a case of classic blackwater fever in a returning traveller, without prior history of malaria infection nor usage of anti-malarial prophylaxis, treated with two courses of oral artemether-lumefantrine combination therapy...
January 16, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29338720/manual-exchange-transfusion-for-severe-imported-falciparum-malaria-a-retrospective-study
#5
Jinfeng Lin, Xiaoying Huang, Gang Qin, Suyan Zhang, Weiwei Sun, Yadong Wang, Ke Ren, Junxian Xu, Xudong Han
BACKGROUND: This study was designed to evaluate the efficacy of exchange transfusion in patients with severe imported falciparum malaria. Twelve patients who met the diagnostic criteria for severe malaria were treated with exchange transfusion 14 times according to a conventional anti-malarial treatment. This study evaluated the efficacy of exchange transfusion for severe imported falciparum malaria. METHODS: Clinical data of severe imported falciparum malaria patients admitted to the intensive care unit (ICU) of Nantong Third People's Hospital from January 2007 to December 2016 were investigated in this retrospective study...
January 16, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29334944/changes-in-malaria-epidemiology-in-germany-2001-2016-a-time-series-analysis
#6
Sabine Vygen-Bonnet, Klaus Stark
BACKGROUND: German surveillance data showed a sharp rise of malaria cases in 2014 and 2015 due to the increased arrival of refugees from malaria endemic countries. A time series analysis of data from 2001 to 2016 was performed in order to describe the epidemiology of imported malaria in Germany in general and of the recent increase in particular. RESULTS: In total, 11,678 malaria cases were notified between 2001 and 2016 (range 526-1063 cases/year). Newly arriving refugees averaged 10 cases/year (1...
January 15, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29334942/poor-response-to-artesunate-treatment-in-two-patients-with-severe-malaria-on-the-thai-myanmar-border
#7
Aung Pyae Phyo, Kyaw Kyaw Win, Aung Myint Thu, Lei Lei Swe, Htike Htike, Candy Beau, Kanlaya Sriprawat, Markus Winterberg, Stephane Proux, Mallika Imwong, Elizabeth A Ashley, Francois Nosten
BACKGROUND: Malaria has declined dramatically along the Thai-Myanmar border in recent years due to malaria control and elimination programmes. However, at the same time, artemisinin resistance has spread, raising concerns about the efficacy of parenteral artesunate for the treatment of severe malaria. CASE PRESENTATION: In November 2015 and April 2017, two patients were treated for severe malaria with parenteral artesunate. Quinine was added within 24 h due to an initial poor response to treatment...
January 15, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29332383/developing-pantetheinase-resistant-pantothenamide-antibacterials-structural-modification-impacts-on-pank-interaction-and-mode-of-action
#8
Leanne Barnard, Konrad Johannes Mostert, Willem A L van Otterlo, Erick Strauss
Pantothenamides (PanAms) are analogues of pantothenate, the biosynthetic precursor of coenzyme A (CoA), and show potent antimicrobial activity against several bacteria and the malaria parasite in vitro. However, pantetheinase enzymes that normally degrade pantetheine in human serum also act on the PanAms, thereby reducing their potency. In this study, we designed analogues of the known antibacterial PanAm N-heptylpantothenamide (N7-Pan) to be resistant to pantetheinase by using three complementary structural modification strategies...
January 14, 2018: ACS Infectious Diseases
https://www.readbyqxmd.com/read/29332155/prevalence-of-the-pfdhfr-and-pfdhps-mutations-among-asymptomatic-pregnant-women-in-southeast-nigeria
#9
Ekpereonne Esu, Costanza Tacoli, Prabhanjan Gai, Nicole Berens-Riha, Michael Pritsch, Thomas Loescher, Martin Meremikwu
Sulfadoxine-pyrimethamine (SP) is the recommended drug for intermittent preventive treatment of malaria in pregnancy in most of sub-Saharan Africa. Resistance to SP is related to mutations in the dhfr and dhps gene of Plasmodium falciparum. This study determined the prevalence of Pfdhfr and Pfdhps polymorphisms found in asymptomatic pregnant women attending antenatal care in Calabar, Nigeria. From October 2013 to November 2014, asymptomatic pregnant women attending antenatal care clinics were enrolled after obtaining informed consent...
January 13, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29328646/vibrational-properties-of-bulk-boric-acid-2a-and-3t-polymorphs-and-their-two-dimensional-layers-measurements-and-density-functional-theory-calculations
#10
Mauricelio Bezerra da Silva, Regina C R Santos, Paulo T C Freire, Ewerton W S Caetano, Valder N Freire
Boric acid (H3BO3) is being used effectively nowadays in traps/baits for the management of Aedes aegypti L. and Aedes albopictus Skuse species of mosquitoes, which are the main spreading vectors worldwide for diseases like malaria, dengue and zika. Previously, we have published results on the structural, electronic and optical properties of its molecular triclinic H3BO3-2A and trigonal H3BO3-3T polymorphs within the framework of density functional theory (DFT). Due to the renewed importance of these materials, the focus of this work is on the vibrational properties of the bulk boric acid 2A and 3T polymorphs...
January 12, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29324864/safety-of-single-low-dose-primaquine-in-glucose-6-phosphate-dehydrogenase-deficient-falciparum-infected-african-males-two-open-label-randomized-safety-trials
#11
Guido J H Bastiaens, Alfred B Tiono, Joseph Okebe, Helmi E Pett, Sam A Coulibaly, Bronner P Gonçalves, Muna Affara, Alphonse Ouédraogo, Edith C Bougouma, Guillaume S Sanou, Issa Nébié, John Bradley, Kjerstin H W Lanke, Mikko Niemi, Sodiomon B Sirima, Umberto d'Alessandro, Teun Bousema, Chris Drakeley
BACKGROUND: Primaquine (PQ) actively clears mature Plasmodium falciparum gametocytes but in glucose-6-phosphate dehydrogenase deficient (G6PDd) individuals can cause hemolysis. We assessed the safety of low-dose PQ in combination with artemether-lumefantrine (AL) or dihydroartemisinin-piperaquine (DP) in G6PDd African males with asymptomatic P. falciparum malaria. METHODS AND FINDINGS: In Burkina Faso, G6PDd adult males were randomized to treatment with AL alone (n = 10) or with PQ at 0...
2018: PloS One
https://www.readbyqxmd.com/read/29321276/ifn-regulatory-factor-3-balances-th1-and-t-follicular-helper-immunity-during-nonlethal-blood-stage-plasmodium-infection
#12
Kylie R James, Megan S F Soon, Ismail Sebina, Daniel Fernandez-Ruiz, Gayle Davey, Urijah N Liligeto, Arya Sheela Nair, Lily G Fogg, Chelsea L Edwards, Shannon E Best, Lianne I M Lansink, Kate Schroder, Jane A C Wilson, Rebecca Austin, Andreas Suhrbier, Steven W Lane, Geoffrey R Hill, Christian R Engwerda, William R Heath, Ashraful Haque
Differentiation of CD4+ Th cells is critical for immunity to malaria. Several innate immune signaling pathways have been implicated in the detection of blood-stage Plasmodium parasites, yet their influence over Th cell immunity remains unclear. In this study, we used Plasmodium-reactive TCR transgenic CD4+ T cells, termed PbTII cells, during nonlethal P. chabaudi chabaudi AS and P. yoelii 17XNL infection in mice, to examine Th cell development in vivo. We found no role for caspase1/11, stimulator of IFN genes, or mitochondrial antiviral-signaling protein, and only modest roles for MyD88 and TRIF-dependent signaling in controlling PbTII cell expansion...
January 10, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29321025/diagnostic-challenges-of-prolonged-post-treatment-clearance-of-plasmodium-nucleic-acids-in-a-pre-transplant-autosplenectomized-patient-with-sickle-cell-disease
#13
Paul M Luethy, Sean C Murphy, Annette M Seilie, Yingda L Xie, Chuen-Yen Lau, John F Tisdale, Matthew M Hsieh, Jessica L Reinhardt, Anna F Lau, Gary A Fahle
BACKGROUND: Autosplenectomy, as a result of sickle cell disease, is an important risk factor for severe malaria. While molecular methods are helpful in providing rapid and accurate infection detection and species identification, the effect of hyposplenism on result interpretation during the course of infection should be carefully considered. CASE PRESENTATION: A 32-year old autosplenectomized Nigerian male with severe sickle cell disease was referred to the National Institutes of Health for allogenic hematopoietic stem cell transplant...
January 10, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29320160/efforts-aimed-to-reduce-attrition-in-antimalarial-drug-discovery-a-systematic-evaluation-of-current-antimalarial-targets-portfolio
#14
María Jesus Chaparro, Felix Calderon, Pablo Castañeda, Elena Fernandez Alvaro, Raquel Gabarro, Francisco-Javier Gamo, María G Gómez-Lorenzo, Julio Martín, Esther Fernandez
Malaria remains a major global health problem. In 2015 alone, more than 200 million cases of malaria were reported, and more than 400,000 deaths occurred. Since 2010, emerging resistance to current front-line ACTs (Artemisinin Combination Therapies) has been detected in endemic countries. Therefore, there is an urgency for new therapies based on novel modes of action, able to relieve symptoms as fast as the artemisinins and/or block malaria transmission. During the past few years, the antimalarial community has focused their efforts on phenotypic screening as a pragmatic approach to identify new hits...
January 10, 2018: ACS Infectious Diseases
https://www.readbyqxmd.com/read/29318993/a-case-of-severe-plasmodium-falciparum-malaria-co-infected-with-hiv-improved-with-exchange-transfusion
#15
Ayşe Sağmak Tartar, Ayhan Akbulut, Ömür Gökmen Sevindik, Hatice Handan Akbulut, Kutbeddin Demirdağ
In our country, within years, despite a dramatic drop in the number of patients with malaria, a dramatic increase in the number of patients with import malaria is noteworthy. A 32-year-old male patient presented with fever, shivering, malaise, and loss of appetite. He had travelled to West Africa. Laboratory findings were as follows: hemoglobin: 8.8 g/dL and anti-HIV: positive. Microscopic examinations of thin blood smears and thick blood preparations revealed widespread trophozoites. The presence of double-dotted ring forms and banana-shaped gametocytes resulted in Plasmodium falciparum malaria being diagnosed...
December 2017: Türkiye Parazitolojii Dergisi
https://www.readbyqxmd.com/read/29316927/global-sequence-diversity-of-the-lactate-dehydrogenase-gene-in-plasmodium-falciparum
#16
Phumin Simpalipan, Sittiporn Pattaradilokrat, Pongchai Harnyuttanakorn
BACKGROUND: Antigen-detecting rapid diagnostic tests (RDTs) have been recommended by the World Health Organization for use in remote areas to improve malaria case management. Lactate dehydrogenase (LDH) of Plasmodium falciparum is one of the main parasite antigens employed by various commercial RDTs. It has been hypothesized that the poor detection of LDH-based RDTs is attributed in part to the sequence diversity of the gene. To test this, the present study aimed to investigate the genetic diversity of the P...
January 9, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29316918/in-silico-epitope-mapping-and-experimental-evaluation-of-the-merozoite-adhesive-erythrocytic-binding-protein-maebl-as-a-malaria-vaccine-candidate
#17
Pedro Cravo, Renato B Machado, Juliana A Leite, Taizy Leda, Rossarin Suwanarusk, Najara Bittencourt, Letusa Albrecht, Carla Judice, Stefanie C P Lopes, Marcus V G Lacerda, Marcelo U Ferreira, Irene S Soares, Yun Shan Goh, Daniel Y Bargieri, François Nosten, Bruce Russell, Laurent Rénia, Fabio T M Costa
BACKGROUND: Technical limitations for culturing the human malaria parasite Plasmodium vivax have impaired the discovery of vaccine candidates, challenging the malaria eradication agenda. The immunogenicity of the M2 domain of the Merozoite Adhesive Erythrocytic Binding Protein (MAEBL) antigen cloned from the Plasmodium yoelii murine parasite, has been previously demonstrated. RESULTS: Detailed epitope mapping of MAEBL through immunoinformatics identified several MHCI, MHCII and B cell epitopes throughout the peptide, with several of these lying in the M2 domain and being conserved between P...
January 10, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29316917/an-observational-analysis-of-the-impact-of-indoor-residual-spraying-with-non-pyrethroid-insecticides-on-the-incidence-of-malaria-in-s%C3%A3-gou-region-mali-2012-2015
#18
Joseph Wagman, Christelle Gogue, Kenzie Tynuv, Jules Mihigo, Elie Bankineza, Mamadou Bah, Diadier Diallo, Andrew Saibu, Jason H Richardson, Diakalkia Kone, Seydou Fomba, Jeff Bernson, Richard Steketee, Laurence Slutsker, Molly Robertson
BACKGROUND: Ségou Region in Central Mali is an area of high malaria burden with seasonal transmission, high access to and use of long-lasting insecticidal nets (LLINs), and resistance to pyrethroids and DDT well documented in Anopheles gambiae s.l. (the principal vector of malaria in Mali). Ségou has recently received indoor residual spraying (IRS) supported by Mali's collaboration with the US President's Malaria Initiative/Africa Indoor Residual Spraying programme. From 2012 to 2015, two different non-pyrethroid insecticides: bendiocarb in 2012 and 2013 and pirimiphos-methyl in 2014 and 2015, were used for IRS in two districts...
January 10, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29316914/differential-induction-of-malaria-liver-pathology-in-mice-infected-with-plasmodium-chabaudi-as-or-plasmodium-berghei-nk65
#19
Diletta Scaccabarozzi, Katrien Deroost, Yolanda Corbett, Natacha Lays, Paola Corsetto, Fausta Omodeo Salè, Philippe E Van den Steen, Donatella Taramelli
BACKGROUND: Cerebral malaria and severe anaemia are the most common deadly complications of malaria, and are often associated, both in paediatric and adult patients, with hepatopathy, whose pathogenesis is not well characterized, and sometimes also with acute respiratory distress syndrome (ARDS). Here, two species of murine malaria, the lethal Plasmodium berghei strain NK65 and self-healing Plasmodium chabaudi strain AS which differ in their ability to cause hepatopathy and/or ARDS were used to investigate the lipid alterations, oxidative damage and host immune response during the infection in relation to parasite load and accumulation of parasite products, such as haemozoin...
January 9, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29316140/a-male-gametocyte-osmiophilic-body-and-microgamete-surface-protein-of-the-rodent-malaria-parasite-plasmodium-yoelii-pymigs-plays-a-critical-role-in-male-osmiophilic-body-formation-and-exflagellation
#20
Mayumi Tachibana, Tomoko Ishino, Eizo Takashima, Takafumi Tsuboi, Motomi Torii
Anopheles mosquitoes transmit Plasmodium parasites of mammals, including the species that cause malaria in humans. Malaria pathology is caused by rapid multiplication of parasites in asexual intraerythrocytic cycles. Sexual stage parasites are also produced during the intraerythrocytic cycle, and are ingested by the mosquito, initiating gametogenesis and subsequent sporogonic stage development. Here, we present a Plasmodium protein, termed microgamete surface protein (MiGS), which has an important role in male gametocyte osmiophilic body (MOB) formation and microgamete function...
January 5, 2018: Cellular Microbiology
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