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https://www.readbyqxmd.com/read/28719306/seasonal-variation-in-the-epidemiology-of-asymptomatic-plasmodium-falciparum-infections-across-two-catchment-areas-in-bongo-district-ghana
#1
Kathryn E Tiedje, Abraham R Oduro, Godfred Agongo, Thomas Anyorigiya, Daniel Azongo, Timothy Awine, Anita Ghansah, Mercedes Pascual, Kwadwo A Koram, Karen P Day
Understanding the epidemiology of asymptomatic Plasmodium falciparum infections is critical for countries to move toward malaria elimination. Using different methods for parasite detection, we evaluated how seasonality, spatial location, and other factors affect the age-specific epidemiology of asymptomatic malaria in Bongo District, Ghana. Asymptomatic prevalence by microscopy decreased significantly from 42.5% at the end of the wet to 27.5% at the end of the dry season (P < 0.001). Using the 18S rRNA polymerase chain reactions (PCRs), all microscopy-negative samples were screened and prevalence of submicroscopic infections also decreased significantly from the wet (55...
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
#2
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/28715415/characterizing-the-malaria-rural-to-urban-transmission-interface-the-importance-of-reactive-case-detection
#3
Karen Molina Gómez, M Alejandra Caicedo, Alexandra Gaitán, Manuela Herrera-Varela, María Isabel Arce, Andrés F Vallejo, Julio Padilla, Pablo Chaparro, M Andreína Pacheco, Ananias A Escalante, Myriam Arevalo-Herrera, Sócrates Herrera Valencia
BACKGROUND: Reported urban malaria cases are increasing in Latin America, however, evidence of such trend remains insufficient. Here, we propose an integrated approach that allows characterizing malaria transmission at the rural-to-urban interface by combining epidemiological, entomological, and parasite genotyping methods. METHODS/PRINCIPAL FINDINGS: A descriptive study that combines active (ACD), passive (PCD), and reactive (RCD) case detection was performed in urban and peri-urban neighborhoods of Quibdó, Colombia...
July 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28701845/fatal-postoperative-hemolysis-due-to-severe-falciparum-malaria
#4
Amol T Kothekar, Vijaya Patil, Nambiraj Konar, Jigeeshu Divatia
A 60-year-old apparently healthy female patient underwent mastectomy for breast cancer. She had sinus tachycardia and no other abnormal finding in the preoperative period. However, the immediate postoperative course was stormy with the development of anemia, thrombocytopenia, hemolysis, and renal failure with severe metabolic acidosis. Peripheral blood smear revealed the presence of ring forms of Plasmodium falciparum. Multiorgan failure and death occurred within 36 h of surgery in spite of initiation of antimalarial agents...
June 2017: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28676055/malaria-in-brazil-colombia-peru-and-venezuela-current-challenges-in-malaria-control-and-elimination
#5
REVIEW
Judith Recht, André M Siqueira, Wuelton M Monteiro, Sonia M Herrera, Sócrates Herrera, Marcus V G Lacerda
In spite of significant progress towards malaria control and elimination achieved in South America in the 2000s, this mosquito-transmitted tropical disease remains an important public health concern in the region. Most malaria cases in South America come from Amazon rain forest areas in northern countries, where more than half of malaria is caused by Plasmodium vivax, while Plasmodium falciparum malaria incidence has decreased in recent years. This review discusses current malaria data, policies and challenges in four South American Amazon countries: Brazil, Colombia, Peru and the Bolivarian Republic of Venezuela...
July 4, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28671944/predominance-of-asymptomatic-and-sub-microscopic-infections-characterizes-the-plasmodium-gametocyte-reservoir-in-the-peruvian-amazon
#6
Eduard Rovira-Vallbona, Juan José Contreras-Mancilla, Roberson Ramirez, Mitchel Guzmán-Guzmán, Gabriel Carrasco-Escobar, Alejandro Llanos-Cuentas, Joseph M Vinetz, Dionicia Gamboa, Anna Rosanas-Urgell
Malaria transmission requires that Anopheles mosquitoes ingest Plasmodium gametocyte stages circulating in the human bloodstream. In the context of malaria elimination, understanding the epidemiology of gametocytes relative to all Plasmodium infections and the contribution of asymptomatic and sub-microscopic parasite carriers to the gametocyte reservoir is necessary, especially in low endemic settings with predominance of P.vivax. A 13-month longitudinal study was conducted in two communities (n = 1935 individuals) of Loreto Department, Peru, with five active screenings for Plasmodium infections and gametocyte stages by quantitative real-time PCR (qPCR) and reverse transcription (RT)-qPCR, respectively...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28670640/peripheral-parasitaemia-and-its-association-with-plasma-cytokines-levels-in-malaria-infected-pregnant-women-in-aba-abia-state-nigeria
#7
M O Ifeanyichukwu, O C Okamgba, G I Amilo, E A Nwokorie
BACKGROUND: Cytokines in pregnant female may not be a normal phenomenon as malarial infection is often associated with strong CD4+ cell activation and up-regulation of pro-inflammatory cytokines. We investigated the relationship between peripheral parasitaemia and plasma levels of cytokines among malaria infected pregnant women in Aba, Abia State, Nigeria. MATERIALS AND METHODS: A total of 206 non-HIV positive asymptomatic malaria parasitaemic (n=144) and non-parasitaemic (n=62) pregnant women were recruited for this study alongside 80 non-pregnant women who served as positive (n=40) and negative (n=40) controls...
2017: African Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28662646/effect-of-transmission-intensity-on-hotspots-and-micro-epidemiology-of-malaria-in-sub-saharan-africa
#8
Polycarp Mogeni, Irene Omedo, Christopher Nyundo, Alice Kamau, Abdisalan Noor, Philip Bejon
BACKGROUND: Malaria transmission intensity is heterogeneous, complicating the implementation of malaria control interventions. We provide a description of the spatial micro-epidemiology of symptomatic malaria and asymptomatic parasitaemia in multiple sites. METHODS: We assembled data from 19 studies conducted between 1996 and 2015 in seven countries of sub-Saharan Africa with homestead-level geospatial data. Data from each site were used to quantify spatial autocorrelation and examine the temporal stability of hotspots...
June 30, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28649273/high-burden-of-malaria-and-anemia-among-tribal-pregnant-women-in-a-chronic-conflict-corridor-in-india
#9
Gustavo Corrêa, Mrinalini Das, Rama Kovelamudi, Nagendra Jaladi, Charlotte Pignon, Kalyan Vysyaraju, Usha Yedla, Vijya Laxmi, Pavani Vemula, Vijaya Gowthami, Hemant Sharma, Daniel Remartinez, Stobdan Kalon, Kirrily de Polnay, Martin De Smet, Petros Isaakidis
BACKGROUND: With more than 200 million cases a year, malaria is an important global health concern, especially among pregnant women. The forested tribal areas of Andhra Pradesh, Telangana and Chhattisgarh in India are affected by malaria and by an on-going chronic conflict which seriously limits access to health care. The burden of malaria and anemia among pregnant women in these areas is unknown; moreover there are no specific recommendations for pregnant women in the Indian national malaria policy...
2017: Conflict and Health
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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