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https://www.readbyqxmd.com/read/29050948/detection-of-malaria-parasites-after-treatment-in-travelers-a-12-months-longitudinal-study-and-statistical-modelling-analysis
#1
Manijeh Vafa Homann, S Noushin Emami, Victor Yman, Christine Stenström, Klara Sondén, Hanna Ramström, Mattias Karlsson, Muhammad Asghar, Anna Färnert
The rapid clearance of malaria parasite DNA from circulation has widely been accepted as a fact without being systemically investigated. We assessed the persistence of parasite DNA in travelers treated for Plasmodium falciparum malaria in a malaria-free area. Venous blood was collected at the time of admission and prospectively up to one year. DNA and RNA were extracted and analyzed using species-specific and gametocyte-specific real-time PCR as well as merozoite surface protein 2 (msp2)-PCR. In 31 successfully treated individuals, asexual parasites were seen by microscopy until two days after treatment, whereas parasite DNA was detected by msp2- and species-specific PCR up to days 31 and 42, respectively...
October 4, 2017: EBioMedicine
https://www.readbyqxmd.com/read/29046412/detection-of-plasmodium-species-by-high-resolution-melt-analysis-of-dna-from-blood-smears-acquired-in-southwestern-uganda
#2
Kennedy Kassaza, Darwin J Operario, Dan Nyehangane, K C Coffey, Mary Namugosa, Lena Turkheimer, Patrick Ojuka, Patrick Orikiriza, Juliet Mwanga-Amumpaire, Frederick Byarugaba, Joel Bazira, Jennifer L Guler, Christopher C Moore, Yap Boum
Background. Microscopic diagnosis of malaria using Giemsa-stained blood smears is the standard of care in resource-limited settings. These smears represent a potential source of DNA for polymerase chain reaction (PCR) testing to confirm Plasmodium infection or for epidemiologic studies of archived samples. Therefore, we assessed the use of DNA extracts from stained blood smears for the detection of Plasmodium species using real-time PCR.Methods. We extracted DNA from archived blood smears and corresponding red blood cell pellets collected from asymptomatic children in Southwestern Uganda in 2010...
October 18, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29041929/absence-of-plasmodium-inui-and-plasmodium-cynomolgi-but-detection-of-plasmodium-knowlesi-and-plasmodium-vivax-infections-in-asymptomatic-humans-in-the-betong-division-of-sarawak-malaysian-borneo
#3
Angela Siner, Sze-Tze Liew, Khamisah Abdul Kadir, Dayang Shuaisah Awang Mohamad, Felicia Kavita Thomas, Mohammad Zulkarnaen, Balbir Singh
BACKGROUND: Plasmodium knowlesi, a simian malaria parasite, has become the main cause of malaria in Sarawak, Malaysian Borneo. Epidemiological data on malaria for Sarawak has been derived solely from hospitalized patients, and more accurate epidemiological data on malaria is necessary. Therefore, a longitudinal study of communities affected by knowlesi malaria was undertaken. METHODS: A total of 3002 blood samples on filter paper were collected from 555 inhabitants of 8 longhouses with recently reported knowlesi malaria cases in the Betong Division of Sarawak, Malaysian Borneo...
October 17, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29041927/diagnostic-performance-of-the-loop-mediated-isothermal-amplification-lamp-based-illumigene-%C3%A2-malaria-assay-in-a-non-endemic-region
#4
Anne-Sophie De Koninck, Lieselotte Cnops, Mattias Hofmans, Jan Jacobs, Dorien Van den Bossche, Jan Philippé
BACKGROUND: Light microscopy and antigen-based rapid diagnostic tests are the primary diagnostic tools for detecting malaria, although being labour-intensive and frequently challenged by lack of personnel's experience and low levels of parasite density. The latter being especially important in non-endemic settings. Novel molecular techniques aim to overcome this drawback. The objective of this study was to assess the diagnostic performance of the illumigene malaria assay(®) (Meridian Bioscience) compared to microscopy, RDT and real-time PCR...
October 17, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29037202/high-prevalence-of-very-low-plasmodium-falciparum-and-plasmodium-vivax-parasitaemia-carriers-in-the-peruvian-amazon-insights-into-local-and-occupational-mobility-related-transmission
#5
Gabriel Carrasco-Escobar, Julio Miranda-Alban, Carlos Fernandez-Miñope, Kimberly C Brouwer, Katherine Torres, Maritza Calderon, Dionicia Gamboa, Alejandro Llanos-Cuentas, Joseph M Vinetz
BACKGROUND: The incidence of malaria due both to Plasmodium falciparum and Plasmodium vivax in the Peruvian Amazon has risen in the past 5 years. This study tested the hypothesis that the maintenance and emergence of malaria in hypoendemic regions such as Amazonia is determined by submicroscopic and asymptomatic Plasmodium parasitaemia carriers. The present study aimed to precisely quantify the rate of very-low parasitaemia carriers in two sites of the Peruvian Amazon in relation to transmission patterns of P...
October 16, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29037193/molecular-surveillance-of-pfhrp2-and-pfhrp3-deletions-in-plasmodium-falciparum-isolates-from-mozambique
#6
Himanshu Gupta, Gloria Matambisso, Beatriz Galatas, Pau Cisteró, Lidia Nhamussua, Wilson Simone, Jane Cunningham, N Regina Rabinovitch, Pedro Alonso, Franciso Saute, Pedro Aide, Alfredo Mayor
BACKGROUND: Malaria programmes use Plasmodium falciparum histidine-rich protein-2 (PfHRP2) based rapid diagnostic tests (RDTs) for malaria diagnosis. The deletion of this target antigen could potentially lead to misdiagnosis, delayed treatment and continuation of active transmission. METHODS: Plasmodium falciparum isolates (n = 1162) collected in Southern Mozambique were assessed by RDTs, microscopy and/or 18SrRNA qPCR. pfhrp2 and pfhrp3 deletions were investigated in isolates from individuals who were negative by RDT but positive by microscopy and/or qPCR (n = 69) using gene-specific PCRs, with kelch13 PCR as the parasite DNA control...
October 16, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29029619/malaria-prevalence-prevention-and-treatment-seeking-practices-among-nomadic-pastoralists-in-northern-senegal
#7
Mame Cheikh Seck, Julie Thwing, Fatou Ba Fall, Jules Francois Gomis, Awa Deme, Yaye Die Ndiaye, Rachel Daniels, Sarah K Volkman, Medoune Ndiop, Mady Ba, Daouda Ndiaye
BACKGROUND: Malaria transmission in Senegal is highly stratified, from low in the dry north to moderately high in the moist south. In northern Senegal, along the Senegal River Valley and in the Ferlo semi-desert region, annual incidence is less than five cases per 1000 inhabitants. Many nomadic pastoralists have permanent dwellings in the Ferlo Desert and Senegal River Valley, but spend dry season in the south with their herds, returning north when the rains start, leading to a concern that this population could contribute to ongoing transmission in the north...
October 13, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29029367/genetic-diversity-of-plasmodium-falciparum-merozoite-surface-protein-1-block-2-glutamate-rich-protein-and-sexual-stage-antigen-pfs25-from-chandigarh-north-india
#8
Hargobinder Kaur, Rakesh Sehgal, Kapil Goyal, Nikita Makkar, Richa Yadav, Praveen K Bharti, Neeru Singh, Nilanju P Sarmah, Pradymna K Mohapatra, Jagadish Mahanta, Devendra Bansal, Ali A Sultan, Jagat R Kanwar
OBJECTIVE: To elucidate the genetic diversity of P. falciparum in residual transmission foci of northern India. METHODS: Clinically suspected malaria patients were screened for malaria infection by microscopy. 48 P. falciparum-infected patients were enrolled from two tertiary care hospitals in Chandigarh, India. Blood samples were collected from enrolled patients, genomic DNA extraction and nested PCR was performed for further species confirmation. Sanger sequencing was carried out using block 2 region of msp1, R2 region of glurp and pfs25 specific primers...
October 13, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/29025399/plasmodium-falciparum-epcr-binding-pfemp1-expression-increases-with-malaria-disease-severity-and-is-elevated-in-retinopathy-negative-cerebral-malaria
#9
Estela Shabani, Benjamin Hanisch, Robert O Opoka, Thomas Lavstsen, Chandy C John
BACKGROUND: Expression of group A and the A-like subset of group B Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) is associated with severe malaria (SM). The diversity of var sequences combined with the challenges of distinct classification of patient pathologies has made studying the role of distinct PfEMP1 variants on malaria disease severity challenging. The application of retinopathy in the recent years has provided a further method to clinically evaluate children with cerebral malaria (CM)...
October 13, 2017: BMC Medicine
https://www.readbyqxmd.com/read/29020373/artemether-lumefantrine-versus-chloroquine-for-the-treatment-of-uncomplicated-plasmodium-knowlesi-malaria-can-know-an-open-label-randomized-controlled-trial
#10
Matthew J Grigg, Timothy William, Bridget E Barber, Giri S Rajahram, Jayaram Menon, Emma Schimann, Christopher S Wilkes, Kaajal Patel, Arjun Chandna, Ric N Price, Tsin W Yeo, Nicholas M Anstey
Background: Plasmodium knowlesi is reported increasingly across Southeast Asia, and is the commonest cause of malaria in Malaysia. No randomized trials have assessed comparative efficacy of artemether-lumefantrine (AL) for knowlesi malaria. Methods: A randomized-controlled trial was conducted in 3 district hospitals in Sabah, Malaysia to compare the efficacy of AL against chloroquine (CQ) for uncomplicated knowlesi malaria. Participants were included if >10kg, parasitemia <20,000/μL, and had a negative Pf-HRP2 rapid-diagnostic-test...
September 4, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29020345/plasmodium-malariae-in-israeli-travelers-a-nationwide-study
#11
Yarden Yavne, Eyal Leshem, Yael Paran, Eyal Nadir, Miriam Weinberger, Michal Stein, Neta Petersiel, Dafna Yahav, Tamar Grossman, Eli Schwartz
Background: Little is known about Plasmodium malariae, a relatively rare cause of malaria in returned travelers. Recently, polymerase chain reaction (PCR) use for malaria diagnosis has enhanced specificity of P. malariae detection. The study objective was to describe the unique aspects of P. malariae diagnosis and clinical course in travelers. Methods: Malaria is a reportable disease in Israel. All PCR-proven P. malariae monoinfections in Israeli travelers between January 2008 and January 2017 were retrieved from the Ministry of Health Reference Parasitology Laboratory...
August 9, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29020325/adapting-reactive-case-detection-strategies-for-falciparum-malaria-in-a-low-transmission-area-in-cambodia
#12
Gabriele Rossi, Rafael Van den Bergh, Chea Nguon, Mark Debackere, Lieven Vernaeve, Nimol Khim, Saorin Kim, Didier Menard, Martin De Smet, Jean-Marie Kindermans
Reactive case detection (RACD) around falciparum malaria cases in Cambodia is performed as rapid diagnostic test-based household screening around index cases, typically with a low detection rate. We improved RACD by including individuals occupationally co-exposed with index cases and PCR-based diagnosis. The positivity rate increased 20-fold, from 0.16% to 3.9%.
September 4, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29017877/therapeutic-efficacy-of-artesunate-amiodaquine-for-treating-uncomplicated-falciparum-malaria-at-ghindae-zonal-referral-hospital-eritrea
#13
Abdu O Mohammed, Seltene Tewolde, Dawit Estifanos, Yohannes Tekeste, Mohammed-Hamid Osman
INTRODUCTION: The aim of this study was to assess the efficacy of artesunate-amodiaquine (AS+AQ) which is the first-line treatment for uncomplicated falciparum malaria in Eritrea. MATERIALS AND METHODS: The study was conducted from December 2014 to March 2015 in Ghindae Zonal Referral Hospital in Northern Red Sea Zone. Out of 481 patients screened, 103 were enrolled in the study. The therapeutic efficacy test was done as per the WHO protocol for a period of 28days of follow-up...
October 7, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29016341/prevalence-of-clinical-and-subclinical-plasmodium-falciparum-and-plasmodium-vivax-malaria-in-two-remote-rural-communities-on-the-china-myanmar-border
#14
Fang Huang, Shannon Takala-Harrison, Hui Liu, Jian-Wei Xu, Heng-Lin Yang, Matthew Adams, Biraj Shrestha, Gillian Mbambo, Demian Rybock, Shui-Sen Zhou, Zhi-Gui Xia, Xiao-Nong Zhou, Christopher V Plowe, Myaing M Nyunt
Malaria infections may be symptomatic, leading to treatment, or "asymptomatic," typically detected through active surveillance, and not leading to treatment. Malaria elimination may require purging both types of infection. Using detection methods with different sensitivities, we conducted a cross-sectional study in two rural communities located along the border between China's Yunnan Province and Myanmar's Shan and Kachin States, to estimate the prevalence of asymptomatic and symptomatic malaria. In Mong Pawk, all infections detected were asymptomatic, and the prevalence of Plasmodium falciparum was 0...
September 5, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29016339/synthetic-antigens-derived-from-plasmodium-falciparum-sporozoite-liver-and-blood-stages-naturally-acquired-immune-response-and-human-leukocyte-antigen-associations-in-individuals-living-in-a-brazilian-endemic-area
#15
Lilian Rose Pratt-Riccio, Daiana De Souza Perce-Da-Silva, Josué Da Costa Lima-Junior, Evelyn Kety Pratt Riccio, Marcelo Ribeiro-Alves, Fátima Santos, Mércia Arruda, Daniel Camus, Pierre Druilhe, Joseli Oliveira-Ferreira, Cláudio Tadeu Daniel-Ribeiro, Dalma Maria Banic
Peptide vaccine strategies using Plasmodium-derived antigens have emerged as an attractive approach against malaria. However, relatively few studies have been conducted with malaria-exposed populations from non-African countries. Herein, the seroepidemiological profile against Plasmodium falciparum of naturally exposed individuals from a Brazilian malaria-endemic area against synthetic peptides derived from vaccine candidates circumsporozoite protein (CSP), liver stage antigen-1 (LSA-1), erythrocyte binding antigen-175 (EBA-175), and merozoite surface protein-3 (MSP-3) was investigated...
September 18, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29016335/performance-of-loop-mediated-isothermal-amplification-for-the-identification-of-submicroscopic-plasmodium-falciparum-infection-in-uganda
#16
Shereen Katrak, Maxwell Murphy, Patience Nayebare, John Rek, Mary Smith, Emmanuel Arinaitwe, Joaniter I Nankabirwa, Moses Kamya, Grant Dorsey, Philip Rosenthal, Bryan Greenhouse
Accurately identifying and targeting the human reservoir of malaria parasitemia is critical for malaria control, and requires a reliable and sensitive diagnostic method. Loop-mediated isothermal amplification (LAMP) is increasingly used to diagnose submicroscopic parasitemia. Although most published studies report the sensitivity of LAMP compared with nested polymerase chain reaction (PCR) as ≥ 80%, they have failed to use a consistent, sensitive diagnostic as a comparator. We used cross-sectional samples from children and adults in Tororo, Uganda, a region with high but declining transmission due to indoor residual spraying, to characterize the sensitivity and specificity of pan-Plasmodium LAMP for detecting submicroscopic infections...
October 9, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28993182/spatial-and-temporal-distribution-of-pfmsp1-and-pfmsp2-alleles-and-genetic-profile-change-of-plasmodium-falciparum-populations-in-gabon
#17
J M NdongNgomo, N P M'Boundoukwé, W Yavo, L C Bongho Mavoungou, M K Bouyou-Akotet, D P Mawili-Mboumba
Plasmodium population dynamics analysis may help to assess the impact of malaria control strategies deployment. In Gabon, new strategies have been introduced, but malaria is still a public health problem marked by a rebound of the prevalence in 2011. The aim of the study was to investigate the spatial and temporal distribution of P. falciparum strains in different areas in Gabon during a period of malaria transmission transition, between 2008 and 2011. A total of 109P. falciparum isolates were genotyped using nested-PCR of Pfmsp1 and Pfmsp2 genes...
October 6, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28991406/burden-of-influenza-among-hospitalized-febrile-children-in-ghana
#18
Benedikt Hogan, Luise Ammer, Marlow Zimmermann, Tabea Binger, Ralf Krumkamp, Nimako Sarpong, Theresa Rettig, Denise Dekker, Benno Kreuels, Lisa Reigl, Kennedy Gyau Boahen, Charity Wiafe, Yaw Adu-Sarkodie, Ellis Owusu-Dabo, Jürgen May, Daniel Eibach
BACKGROUND: Influenza surveillance data from Africa indicate a substantial disease burden with high mortality. However local influenza data from district hospitals with limited laboratory facilities are still scarce. OBJECTIVES: To identify the frequency and seasonal distribution of influenza among hospitalized febrile children in a rural hospital in Ghana and to describe differential diagnoses to other severe febrile infections. METHODS: Between January 2014 and April 2015 all children with a temperature of ≥38°C admitted to a district hospital in Ghana were screened for influenza A and B by RT-PCR and differentiated to subtypes A(H1N1)pdm09 and A(H3N2)...
October 9, 2017: Influenza and Other Respiratory Viruses
https://www.readbyqxmd.com/read/28988541/a-randomised-double-blind-clinical-phase-ii-trial-of-the-efficacy-safety-tolerability-and-pharmacokinetics-of-a-single-dose-combination-treatment-with-artefenomel-and-piperaquine-in-adults-and-children-with-uncomplicated-plasmodium-falciparum-malaria
#19
Fiona Macintyre, Yeka Adoke, Alfred B Tiono, Tran Thanh Duong, Ghyslain Mombo-Ngoma, Marielle Bouyou-Akotet, Halidou Tinto, Quique Bassat, Saadou Issifou, Marc Adamy, Helen Demarest, Stephan Duparc, Didier Leroy, Bart E Laurijssens, Sophie Biguenet, Afizi Kibuuka, Antoinette Kitoto Tshefu, Melnick Smith, Chanelle Foster, Illse Leipoldt, Peter G Kremsner, Bui Quang Phuc, Alphonse Ouedraogo, Michael Ramharter
BACKGROUND: The clinical development of a single encounter treatment for uncomplicated malaria has the potential to significantly improve the effectiveness of antimalarials. Exploratory data suggested that the combination of artefenomel and piperaquine phosphate (PQP) has the potential to achieve satisfactory cure rates as a single dose therapy. The primary objective of the study was to determine whether a single dose of artefenomel (800 mg) plus PQP in ascending doses is an efficacious treatment for uncomplicated Plasmodium falciparum malaria in the 'target' population of children ≤ 5 years of age in Africa as well as Asian patients of all ages...
October 9, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28978319/acute-undifferentiated-fever-in-india-a-multicentre-study-of-aetiology-and-diagnostic-accuracy
#20
Kristine Mørch, Anand Manoharan, Sara Chandy, Novin Chacko, Gerardo Alvarez-Uria, Suvarna Patil, Anil Henry, Joel Nesaraj, Cijoy Kuriakose, Ashita Singh, Siby Kurian, Christel Gill Haanshuus, Nina Langeland, Bjørn Blomberg, George Vasanthan Antony, Dilip Mathai
BACKGROUND: The objectives of this study were to determine the proportion of malaria, bacteraemia, scrub typhus, leptospirosis, chikungunya and dengue among hospitalized patients with acute undifferentiated fever in India, and to describe the performance of standard diagnostic methods. METHODS: During April 2011-November 2012, 1564 patients aged ≥5 years with febrile illness for 2-14 days were consecutively included in an observational study at seven community hospitals in six states in India...
October 4, 2017: BMC Infectious Diseases
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