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Scientific Articles

NOT Open Access | Capture and Detection of Plasmodium vivax Lactate Dehydrogenase in a Bead-Based Multiplex Immunoassay

March 9, 2020 - 14:30 -- NOT Open Access
Author(s): 
Rogier E, Nace D, Ljolje D, Lucchi NW, Udhayakumar V, Aidoo M
Reference: 
Am J Trop Med Hyg. 2020 Mar 2

Laboratory detection of malaria antigens has proved valuable for research and epidemiological purposes. We recently developed a bead-based multiplex antigen assay for pan-Plasmodium and Plasmodium falciparum targets. Here, we report integration of a Plasmodium vivax–specific target to this multiplex panel: P. vivax lactate dehydrogenase (PvLDH).

The activation of BAFF/APRIL system in spleen and lymph nodes of Plasmodium falciparum infected patients

March 9, 2020 - 14:28 -- Open Access
Author(s): 
Dechkhajorn W, Benjathummarak S, Glaharn S, Chaisri U, Viriyavejakul P, Maneerat Y
Reference: 
Sci Rep. 2020 Mar 2;10(1):3865

Previous studies have reported activation of the B cell-activating factor (BAFF)/a proliferation-inducing ligand (APRIL) system in T independent immunity against malaria infection. Plasmodium falciparum (P. falciparum) infected animal model is not feasible. Therefore, little is known about the occurrence of BAFF/APRIL system and changes in falciparum lymphoid tissues. This study aimed to investigate the expression of BAFF/APRIL system components in lymphoid tissues from P. falciparum infected patients.

Cas9-Mediated Gene-Editing in the Malaria Mosquito Anopheles stephensi by ReMOT Control

March 9, 2020 - 14:26 -- Open Access
Author(s): 
Macias VM, McKeand S, Chaverra-Rodriguez D, Hughes GL, Fazekas A, Pujhari S, Jasinskiene N, James AA, Rasgon JL
Reference: 
G3 (Bethesda). 2020 Mar 2. pii: g3.401133.2020

Innovative tools are essential for advancing malaria control and depend on an understanding of molecular mechanisms governing transmission of malaria parasites by Anopheles mosquitoes. CRISPR/Cas9-based gene disruption is a powerful method to uncover underlying biology of vector-pathogen interactions and can itself form the basis of mosquito control strategies. However, embryo injection methods used to genetically manipulate mosquitoes (especially Anopheles) are difficult and inefficient, particularly for non-specialist laboratories.

NOT Open Access | Early endothelial activation precedes glycocalyx degradation and microvascular dysfunction in experimentally induced Plasmodium falciparum and Plasmodium vivax infection

March 9, 2020 - 14:24 -- NOT Open Access
Author(s): 
Woodford J, Yeo TW, Piera KA, Butler K, Weinberg JB, McCarthy JS, Anstey NM, Barber BE
Reference: 
Infect Immun. 2020 Mar 2. pii: IAI.00895-19

Endothelial activation and microvascular dysfunction are key pathogenic processes in severe malaria. We evaluated the early role of these processes in experimentally induced P. falciparum and P. vivax infection.

NOT Open Access | Novel insights into Plasmodium vivax therapeutic failure: CYP2D6 activity and time of exposure to malaria modulate the risk of recurrence

March 9, 2020 - 14:21 -- NOT Open Access
Author(s): 
Silvino ACR, Kano FS, Costa MA, Fontes CJF, Soares IS, Brito CFA, Carvalho LH, Sousa TN
Reference: 
Antimicrob Agents Chemother. 2020 Mar 2. pii: AAC.02056-19

Plasmodium vivax relapse is one of the major causes of sustained global malaria transmission. Primaquine (PQ) is the only commercial drug available to prevent relapses, and its efficacy is dependent on metabolic activation by cytochrome P450 2D6 (CYP2D6). Impaired CYP2D6 function, caused by allelic polymorphisms, leads to the therapeutic failure of PQ as a radical cure for P. vivax malaria.

Comprehensive proteomics investigation of P. vivax-infected human plasma and parasite isolates

March 9, 2020 - 14:20 -- Open Access
Author(s): 
Venkatesh A, Aggarwal S, Kumar S, Rajyaguru S, Kumar V, Bankar S, Shastri J, Patankar S, Srivastava S
Reference: 
BMC Infect Dis. 2020 Mar 2;20(1):188

In recent times, Plasmodium vivax (P. vivax) has become a serious threat to public health due to its ability to cause severe infection with fatal outcomes. Its unique biology makes it resilient to control measures that are otherwise effective against P. falciparum. A deeper understanding of P. vivax biology and pathogenesis is, therefore, essential for developing the right control strategies. 

Use of Insecticides in Agriculture and the Prevention of Vector-Borne Diseases: Population Knowledge, Attitudes, Practices and Beliefs in Elibou, South Côte d'Ivoire

March 9, 2020 - 14:17 -- Open Access
Author(s): 
N'Dri BP, Heitz-Tokpa K, Chouaïbou M, Raso G, Koffi AJ, Coulibaly JT, Yapi RB, Müller P, Utzinger J
Reference: 
Trop Med Infect Dis. 2020 Mar 1; 5(1). pii: E36

People’s knowledge, attitudes, practices and beliefs (KAPB) pertaining to malaria are generally well described. However, little is known about population knowledge and awareness of insecticide resistance in malaria vectors. The aim of this study was to investigate KAPB related to insecticide resistance in malaria vectors due to the use of insecticides in agriculture and the prevention against mosquitoes. In mid-2017, we carried out a cross-sectional survey in Elibou, South Côte d’Ivoire, employing a mixed methods approach.

Molecular characterization of Plasmodium falciparum antifolate resistance markers in Thailand between 2008 and 2016

March 9, 2020 - 14:11 -- Open Access
Author(s): 
Rungniran Sugaram, Kanokon Suwannasin, Chanon Kunasol, Vivek Bhakta Mathema, Nicholas P. J. Day, Prayuth Sudathip, Preecha Prempree, Arjen M. Dondorp and Mallika Imwong
Reference: 
Malaria Journal 2020 19:107, 4 March 2020

Resistance to anti-malarials is a major threat to the control and elimination of malaria. Sulfadoxine–pyrimethamine (SP) anti-malarial treatment was used as a national policy for treatment of uncomplicated falciparum malaria in Thailand from 1973 to 1990. In order to determine whether withdrawal of this antifolate drug has led to restoration of SP sensitivity, the prevalence of genetic markers of SP resistance was assessed in historical Thai samples.

Costs of insecticide-treated bed net distribution systems in sub-Saharan Africa

March 9, 2020 - 14:09 -- Open Access
Author(s): 
Sara S. Scates, Timothy P. Finn, Janna Wisniewski, David Dadi, Renata Mandike, Mwinyi Khamis, George Greer, Naomi Serbantez, Sylvester Segbaya, Prince Owusu, Jules Mihigo, Lilia Gerberg, Angela Acosta, Hannah Koenker and Joshua Yukich
Reference: 
Malaria Journal 2020 19:105, 4 March 2020

Insecticide-treated nets (ITNs) are one of the most cost-effective measures for preventing malaria. The World Health Organization recommends both large-scale mass distribution campaigns and continuous distributions (CD) as part of a multifaceted strategy to achieve and sustain universal access to ITNs. A combination of these strategies has been effective for scaling up ITN access. For policy makers to make informed decisions on how to efficiently implement CD or combined strategies, information on the costs and cost-effectiveness of these delivery systems is necessary, but relatively few published studies of the cost continuous distribution systems exist.

From malaria control to elimination within a decade: lessons learned from Timor Leste, a newly independent country

March 9, 2020 - 14:07 -- Open Access
Author(s): 
A. M. G. Manel Yapabandara, Maria do Rosario de Fatima Mota, Raul Sarmento, Johanes don Bosco and Rajitha Wickremasinghe
Reference: 
Malaria Journal 2020 19:104, 4 March 2020

Timor Leste has made remarkable progress from malaria control to malaria elimination in a span of 10 years during which organized malaria control efforts were instituted. The good practices and possible factors that have contributed to the remarkable transition from malaria control to elimination in a newly independent country devastated by civil unrest which left the entire administrative structure including the health sector in a disrupted non-functional state are highlighted.

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