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asymptomatic malaria

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https://www.readbyqxmd.com/read/28633672/influence-of-the-number-and-timing-of-malaria-episodes-during-pregnancy-on-prematurity-and-small-for-gestational-age-in-an-area-of-low-transmission
#1
Kerryn A Moore, Julie A Simpson, Jacher Wiladphaingern, Aung Myat Min, Mupawjay Pimanpanarak, Moo Kho Paw, Jathee Raksuansak, Sasithon Pukrittayakamee, Freya J I Fowkes, Nicholas J White, François Nosten, Rose McGready
BACKGROUND: Most evidence on the association between malaria in pregnancy and adverse pregnancy outcomes focuses on falciparum malaria detected at birth. We assessed the association between the number and timing of falciparum and vivax malaria episodes during pregnancy on small-for-gestational-age (SGA) and preterm birth. METHODS: We analysed observational data collected from antenatal clinics on the Thailand-Myanmar border (1986-2015). We assessed the effects of the total number of malaria episodes in pregnancy on SGA and the effects of malaria in pregnancy on SGA, very preterm birth, and late preterm birth, by the gestational age at malaria detection and treatment using logistic regression models with time-dependent malaria variables (monthly intervals)...
June 21, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28615061/synergistic-effect-of-il-12-and-il-18-induces-tim3-regulation-of-%C3%AE-%C3%AE-t-cell-function-and-decreases-the-risk-of-clinical-malaria-in-children-living-in-papua-new-guinea
#2
Louis Schofield, Lisa J Ioannidis, Stephan Karl, Leanne J Robinson, Qiao Y Tan, Daniel P Poole, Inoni Betuela, Danika L Hill, Peter M Siba, Diana S Hansen, Ivo Mueller, Emily M Eriksson
BACKGROUND: γδ T cells are important for both protective immunity and immunopathogenesis during malaria infection. However, the immunological processes determining beneficial or detrimental effects on disease outcome remain elusive. The aim of this study was to examine expression and regulatory effect of the inhibitory receptor T-cell immunoglobulin domain and mucin domain 3 (TIM3) on γδ T cells. While TIM3 expression and function on conventional αβ T cells have been clearly defined, the equivalent characterization on γδ T cells and associations with disease outcomes is limited...
June 15, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28606143/effectiveness-of-reactive-case-detection-for-malaria-elimination-in-three-archetypical-transmission-settings-a-modelling-study
#3
Jaline Gerardin, Caitlin A Bever, Daniel Bridenbecker, Busiku Hamainza, Kafula Silumbe, John M Miller, Thomas P Eisele, Philip A Eckhoff, Edward A Wenger
BACKGROUND: Reactive case detection could be a powerful tool in malaria elimination, as it selectively targets transmission pockets. However, field operations have yet to demonstrate under which conditions, if any, reactive case detection is best poised to push a region to elimination. This study uses mathematical modelling to assess how baseline transmission intensity and local interconnectedness affect the impact of reactive activities in the context of other possible intervention packages...
June 12, 2017: Malaria Journal
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
#4
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/28580365/low-quality-housing-is-associated-with-increased-risk-of-malaria-infection-a-national-population-based-study-from-the-low-transmission-setting-of-swaziland
#5
Nomcebo Dlamini, Michelle S Hsiang, Nyasatu Ntshalintshali, Deepa Pindolia, Regan Allen, Nomcebo Nhlabathi, Joseph Novotny, Mi-Suk Kang Dufour, Alemayehu Midekisa, Roly Gosling, Arnaud LeMenach, Justin Cohen, Grant Dorsey, Bryan Greenhouse, Simon Kunene
BACKGROUND: Low-quality housing may confer risk of malaria infection, but evidence in low transmission settings is limited. METHODS: To examine the relationship between individual level housing quality and locally acquired infection in children and adults, a population-based cross-sectional analysis was performed using existing surveillance data from the low transmission setting of Swaziland. From 2012 to 2015, cases were identified through standard diagnostics in health facilities and by loop-mediated isothermal amplification in active surveillance, with uninfected subjects being household members and neighbors...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28579627/carriage-of-sub-microscopic-sexual-and-asexual-plasmodium-falciparum-stages-in-the-dry-season-at-navrongo-ghana
#6
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/28579526/overview-of-human-genetic-susceptibility-to-malaria-from-parasitemia-control-to-severe-disease
#7
Sandrine Marquet
Malaria is a life-threatening blood disease caused by the protozoan Plasmodium. Infection may lead to several different patterns of symptoms in the host: asymptomatic state, uncomplicated disease or severe disease. Severe malaria occurs mostly in young children and is a major cause of death. Disease is thought to result from the sequestration of parasites in the small blood vessels of the brain and the deregulation of key immune system elements. The cellular and molecular regulatory mechanisms underlying the pathogenesis of disease are however not fully understood...
June 1, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28556586/dihydroartemisinin-piperaquine-versus-artesunate-amodiaquine-for-treatment-of-malaria-infection-in-pregnancy-in-ghana-an-open-label-randomized-non-inferiority-trial
#8
Joseph Osarfo, Harry Tagbor, Matthew Cairns, Michael Alifrangis, Pascal Magnussen
OBJECTIVE: To determine whether dihydroartemisinin-piperaquine (DHA-PPQ) is non-inferior to artesunate-amodiaquine (ASAQ) for treating uncomplicated malaria infection in pregnancy. METHODS: 417 second/ third trimester pregnant women with confirmed asymptomatic Plasmodium falciparum parasitaemia were randomized to receive DHA-PPQ or ASAQ over 3 days. Women were followed up on days 1, 2, 3, 7, 14, 28 and 42 after treatment start and at delivery for parasitological, haematological, birth outcomes and at 6-weeks post-partum to ascertain the health status of the babies...
May 28, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28545457/malaria-prevalence-in-asymptomatic-and-symptomatic-children-in-kiwangwa-bagamoyo-district-tanzania
#9
Deborah Sumari, Felista Mwingira, Majige Selemani, Joseph Mugasa, Kefas Mugittu, Paul Gwakisa
BACKGROUND: Malaria prevalence continues to decline across sub-Saharan Africa as a result of various intervention strategies. However, the diseases still poses a public health concern in the region. While symptomatic malaria is recognized and treated, asymptomatic infections become increasingly important for interrupting transmission. A cross-sectional survey was conducted to assess malaria prevalence in symptomatic and asymptomatic children in Kiwangwa ward in Bagamoyo District in Tanzania...
May 25, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28531196/co-inheritance-of-glucose-6-phosphate-dehydrogenase-deficiency-mutations-and-hemoglobin-e-in-a-kachin-population-in-a-malaria-endemic-region-of-southeast-asia
#10
Zeshuai Deng, Fang Yang, Yao Bai, Lijun He, Qing Li, Yanrui Wu, Lan Luo, Hong Li, Limei Ma, Zhaoqing Yang, Yongshu He, Liwang Cui
Glucose-6-phosphate dehydrogenase (G6PD) deficiency and hemoglobin E (HbE, β26 Glu-Lys) are two common red cell disorders in Southeast Asia. G6PD deficiency produces hemolytic anemia, which can be triggered by certain drugs or infections. HbE is asymptomatic or is manifested as microcytic, minimally hemolytic anemia. The association between G6PD deficiency and HbE is little understood. This study aimed to investigate G6PD deficiency and HbE in a Kachin ethnic group in the China-Myanmar border area. G6PD enzyme activity was measured using a quantitative G6PD assay, G6PD variants genotyped by the SNaPshot assay, and an HbE gene mutation identified by an amplification refractory mutation system and subsequently confirmed by using a reverse dot blot hybridization assay from 100 unrelated individuals in the study area...
2017: PloS One
https://www.readbyqxmd.com/read/28526019/mass-anti-malarial-administration-in-western-cambodia-a-qualitative-study-of-factors-affecting-coverage
#11
Christopher Pell, Rupam Tripura, Chea Nguon, Phaikyeong Cheah, Chan Davoeung, Chhouen Heng, Lim Dara, Ma Sareth, Arjen Dondorp, Lorenz von Seidlein, Thomas J Peto
BACKGROUND: Mass anti-malarial administration has been proposed as a key component of the Plasmodium falciparum malaria elimination strategy in the Greater Mekong sub-Region. Its effectiveness depends on high levels of coverage in the target population. This article explores the factors that influenced mass anti-malarial administration coverage within a clinical trial in Battambang Province, western Cambodia. METHODS: Qualitative data were collected through semi-structured interviews and focus group discussions with villagers, in-depth interviews with study staff, trial drop-outs and refusers, and observations in the communities...
May 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28498860/genetic-micro-epidemiology-of-malaria-in-papua-indonesia-extensive-p-vivax-diversity-and-a-distinct-subpopulation-of-asymptomatic-p-falciparum-infections
#12
Zuleima Pava, Rintis Noviyanti, Irene Handayuni, Hidayat Trimarsanto, Leily Trianty, Faustina H Burdam, Enny Kenangalem, Retno A S Utami, Yusrifar K Tirta, Farah Coutrier, Jeanne R Poespoprodjo, Ric N Price, Jutta Marfurt, Sarah Auburn
BACKGROUND: Genetic analyses of Plasmodium have potential to inform on transmission dynamics, but few studies have evaluated this on a local spatial scale. We used microsatellite genotyping to characterise the micro-epidemiology of P. vivax and P. falciparum diversity to inform malaria control strategies in Timika, Papua Indonesia. METHODS: Genotyping was undertaken on 713 sympatric P. falciparum and P. vivax isolates from a cross-sectional household survey and clinical studies conducted in Timika...
2017: PloS One
https://www.readbyqxmd.com/read/28486979/mediation-of-the-effect-of-malaria-in-pregnancy-on-stillbirth-and-neonatal-death-in-an-area-of-low-transmission-observational-data-analysis
#13
Kerryn A Moore, Freya J I Fowkes, Jacher Wiladphaingern, Nan San Wai, Moo Kho Paw, Mupawjay Pimanpanarak, Verena I Carrara, Jathee Raksuansak, Julie A Simpson, Nicholas J White, François Nosten, Rose McGready
BACKGROUND: Malaria in pregnancy is preventable and contributes significantly to the estimated 5.5 million stillbirths and neonatal deaths that occur annually. The contribution of malaria in pregnancy in areas of low transmission has not been quantified, and the roles of maternal anaemia, small-for-gestational-age status, and preterm birth in mediating the effect of malaria in pregnancy on stillbirth and neonatal death are poorly elucidated. METHODS: We analysed observational data routinely collected at antenatal clinics on the Thai-Myanmar border (1986-2015)...
May 10, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28465550/in-vivo-efficacy-of-chloroquine-to-clear-asymptomatic-infections-in-mozambican-adults-a-randomized-placebo-controlled-trial-with-implications-for-elimination-strategies
#14
Beatriz Galatas, Lidia Nhamussua, Baltazar Candrinho, Lurdes Mabote, Pau Cisteró, Himanshu Gupta, Regina Rabinovich, Clara Menéndez, Eusebio Macete, Francisco Saute, Alfredo Mayor, Pedro Alonso, Quique Bassat, Pedro Aide
Recent reports regarding the re-emergence of parasite sensitivity to chloroquine call for a new consideration of this drug as an interesting complementary tool in malaria elimination efforts, given its good safety profile and long half-life. A randomized (2:1), single-blind, placebo-controlled trial was conducted in Manhiça, Mozambique, to assess the in-vivo efficacy of chloroquine to clear plasmodium falciparum (Pf) asymptomatic infections. Primary study endpoint was the rate of adequate and parasitological response (ACPR) to therapy on day 28 (PCR-corrected)...
May 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28460834/asymptomatic-plasmodial-infection-in-colombian-pregnant-women
#15
Jaime Carmona-Fonseca, Olga M Agudelo, Eliana M Arango
Information about asymptomatic plasmodial infection is scarce in the world, and the current antimalarial program goals (control, elimination, and eradication) demand this evidence to be well documented in different populations and malaria transmission settings. This study aimed to measure the prevalence of API in Colombian pregnant women at delivery. A retrospective prevalence survey was used. Women were recruited at hospital obstetric facility in each of the municipalities of Turbo, Necoclí in Antioquia department, and Puerto Libertador in Córdoba department...
April 28, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28459219/a-combined-strategy-for-screening-a-clustered-mobile-population-returning-from-highly-endemic-areas-for-plasmodium-falciparum
#16
Mei Li, Jun Li, Zhigui Xia, Ning Xiao, Weikang Jiang, Yongkang Wen
INTRODUCTION: Early and accurate diagnosis of imported malaria cases in clusters is crucial for protecting the health of patients and local populations, especially confirmed parasitic persons who are asymptomatic. METHODOLOGY: A total of 226 gold miners who had stayed in highly endemic areas of Ghana for more than six months and returned in clusters were selected randomly. Blood samples from them were tested with microscopy, nest polymerase chain reaction, and rapid diagnostic test (RDT)...
April 30, 2017: Journal of Infection in Developing Countries
https://www.readbyqxmd.com/read/28454880/expression-of-negative-immune-regulatory-molecules-pro-inflammatory-chemokine-and-cytokines-in-immunopathology-of-ecm-developing-mice
#17
Ashwin V Khandare, Deepali Bobade, Mangesh Deval, Tushar Patil, Bhaskar Saha, D Prakash
The pathological events in human cerebral malaria are mimicked in the experimental cerebral malaria (ECM) in Plasmodium berghei ANKA (PBA)-infected C57BL/6 mice. Although previously implied in ECM, the kinetics of cytokines and chemokines expression-an essential functional feature for defining causality in ECM development-remained untested. Herein, we characterized the immunopathological changes and the expression of negative immune regulatory molecules, cytokines and chemokines through asymptomatic (3days after infection, 3dpi), symptomatic (5dpi) and ECM (7dpi) stages in PBA-infected C57BL/6 mice...
April 25, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28454546/asymptomatic-plasmodium-vivax-infections-induce-robust-igg-responses-to-multiple-blood-stage-proteins-in-a-low-transmission-region-of-western-thailand
#18
Rhea J Longley, Camila T França, Michael T White, Chalermpon Kumpitak, Patiwat Sa-Angchai, Jakub Gruszczyk, Jessica B Hostetler, Anjali Yadava, Christopher L King, Rick M Fairhurst, Julian C Rayner, Wai-Hong Tham, Wang Nguitragool, Jetsumon Sattabongkot, Ivo Mueller
BACKGROUND: Thailand is aiming to eliminate malaria by the year 2024. Plasmodium vivax has now become the dominant species causing malaria within the country, and a high proportion of infections are asymptomatic. A better understanding of antibody dynamics to P. vivax antigens in a low-transmission setting, where acquired immune responses are poorly characterized, will be pivotal for developing new strategies for elimination, such as improved surveillance methods and vaccines. The objective of this study was to characterize total IgG antibody levels to 11 key P...
April 28, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28448988/anaemia-following-artemisinin-based-combination-treatments-of-uncomplicated-plasmodium-falciparum-malaria-in-children-temporal-patterns-of-haematocrit-and-the-use-of-uncomplicated-hyperparasitaemia-as-a-model-for-evaluating-late-appearing-anaemia
#19
Akin Sowunmi, Kazeem Akano, Godwin Ntadom, Adejumoke Ayede, Stephen Oguche, Chimere Agomo, Henrietta Okafor, Ismaila Watila, Martin Meremikwu, William Ogala, Philip Agomo, Elsie Adowoye, Bayo Fatunmbi, Temitope Aderoyeje, Christian Happi, Grace Gbotosho, Onikepe Folarin
BACKGROUND: In severe malaria, intravenous artesunate may cause delayed haemolytic anaemia but there has been little evaluation of the propensity of oral artemisinin-based combination treatments (ACTs) to cause late-appearing anaemia. METHODS: The frequency of anaemia (haematocrit <30%), and temporal changes in haematocrit were evaluated in 1,191 malarious children following ACTs. "Haematocrit conservation" was evaluated by using the fall in haematocrit/1,000 asexual parasites cleared from the peripheral blood (FIH/1,000 asexual parasites cpb), and the ratio of the average haematocrit (on the first 3 days of starting treatment):total parasitaemia cleared...
2017: Chemotherapy
https://www.readbyqxmd.com/read/28444232/co-trimoxazole-prophylaxis-asymptomatic-malaria-parasitemia-and-infectious-morbidity-in-hiv-exposed-uninfected-infants-in-malawi-the-ban-study
#20
Nicole L Davis, Jeffrey Wiener, Jonathan J Juliano, Linda Adair, Charles S Chasela, Dumbani Kayira, Michael G Hudgens, Charles van der Horst, Denise J Jamieson, Athena P Kourtis
Background: HIV-exposed infants are disproportionately at risk of morbidity and mortality compared with their HIV-unexposed counterparts. The role of co-trimoxazole preventive therapy (CPT) in reducing leading causes of infectious morbidity is unclear. Methods: We used data from the Breastfeeding, Antiretrovirals and Nutrition (BAN) clinical trial (conducted 2004-2010, Malawi) to assess the association of 1) CPT and 2) asymptomatic malaria parasitemia with respiratory and diarrheal morbidity in infants...
April 21, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
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