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Plasmodium vivax and treatment

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https://www.readbyqxmd.com/read/29317838/primaquine-double-dose-for-7-days-is-inferior-to-single-dose-treatment-for-14-days-in-preventing-plasmodium-vivax-recurrent-episodes-in-suriname
#1
M Sigrid Mac Donald-Ottevanger, Malti R Adhin, Jeetendra Kumar Jitan, Gustavo Bretas, Stephen Gs Vreden
Background: Recurrent episodes of Plasmodium vivax are caused by dormant liver stages of the parasite, which are not eradicated by choloroquine. Therefore, effective treatment also includes the use of primaquine (PQ). However, this secondary preventive therapy is often not effective, mostly due to poor adherence to the relatively long treatment course, justifying a comparative study of the efficacy of different durations of PQ treatment. Materials and methods: We included patients presenting with an acute and documented P...
2018: Infection and Drug Resistance
https://www.readbyqxmd.com/read/29304258/the-relative-contribution-of-symptomatic-and-asymptomatic-plasmodium-vivax-and-plasmodium-falciparum-infections-to-the-infectious-reservoir-in-a-low-endemic-setting-in-ethiopia
#2
Fitsum G Tadesse, Hannah C Slater, Wakweya Chali, Karina Teelen, Kjerstin Lanke, Mulualem Belachew, Temesgen Menberu, Girma Shumie, Getasew Shitaye, Lucy C Okell, Wouter Graumans, Geert-Jan van Gemert, Soriya Kedir, Addisu Tesfaye, Feleke Belachew, Wake Abebe, Hassen Mamo, Robert Sauerwein, Taye Balcha, Abraham Aseffa, Delenasaw Yewhalaw, Endalamaw Gadisa, Chris Drakeley, Teun Bousema
Background: The majority of P. vivax and P. falciparum infections in low-endemic settings are asymptomatic. The relative contribution to the infectious reservoir of these infections, often of low-parasite-density, compared to clinical malaria cases, is currently unknown but important for malaria elimination strategies. Methods: We assessed infectivity of passively-recruited symptomatic malaria patients (n=41) and community-recruited asymptomatic individuals with microscopy- (n=41) and PCR-detected infections (n=82) using membrane feeding assays with Anopheles arabiensis mosquitoes in Adama, Ethiopia...
January 3, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29280424/treatment-seeking-behavior-after-the-implementation-of-a-unified-policy-of-dihydroartemisinin-piperaquine-for-the-treatment-of-uncomplicated-malaria-in-papua-indonesia
#3
Angela Devine, Enny Kenangalem, Lenny Burdarm, Nicholas M Anstey, Jeanne Rini Poespoprodjo, Ric N Price, Shunmay Yeung
Artemisinin combination therapy is recommended for the treatment of multidrug resistant Plasmodium falciparum and Plasmodium vivax. In March 2006, antimalarial policy in Indonesia was changed to a unified treatment with dihydroartemisinin-piperaquine for all species of malaria because of the low efficacy of previous drug treatments. In 2013, a randomized cross-sectional household survey in Papua was used to collect data on demographics, parasite positivity, treatment-seeking behavior, diagnosis and treatment of malaria, and household costs...
December 26, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29258505/malaria-prevalence-in-mangaluru-city-area-in-the-southwestern-coastal-region-of-india
#4
Kiran K Dayanand, Kishore Punnath, Valleesha Chandrashekar, Rajeshwara N Achur, Srinivas B Kakkilaya, Susanta K Ghosh, Suchetha Kumari, D Channe Gowda
BACKGROUND: Malaria is highly prevalent in many parts of India and the Indian subcontinent. Mangaluru, a city in the southwest coastal region of Karnataka state in India, and surrounding areas are malaria endemic with 10-12 annual parasite index. Despite high endemicity, to-date, very little has been reported on the epidemiology and burden of malaria in this area. METHODS: A cross-sectional surveillance of malaria cases was performed among 900 febrile symptomatic native people (long-time residents) and immigrant labourers (temporary residents) living in Mangaluru city area...
December 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29237012/clinical-implications-of-plasmodium-resistance-to-atovaquone-proguanil-a-systematic-review-and-meta-analysis
#5
Henry M Staines, Rebekah Burrow, Beatrix Huei-Yi Teo, Irina Chis Ster, Peter G Kremsner, Sanjeev Krishna
Background: Atovaquone/proguanil, registered as Malarone®, is a fixed-dose combination recommended for first-line treatment of uncomplicated Plasmodium falciparum malaria in non-endemic countries and its prevention in travellers. Mutations in the cytochrome bc1 complex are causally associated with atovaquone resistance. Methods: This systematic review assesses the clinical efficacy of atovaquone/proguanil treatment of uncomplicated malaria and examines the extent to which codon 268 mutation in cytochrome b influences treatment failure and recrudescence based on published information...
December 11, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29216842/a-clinical-tool-to-predict-plasmodium-vivax-recurrence-in-malaysia
#6
Norliza Mat Ariffin, Farida Islahudin, Endang Kumolosasi, Mohd Makmor-Bakry
BACKGROUND: Recurrence rates of Plasmodium vivax infections differ across various geographic regions. Interestingly, South-East Asia and the Asia-Pacific region are documented to exhibit the most frequent recurrence incidences. Identifying patients at a higher risk for recurrences gives valuable information in strengthening the efforts to control P. vivax infections. The aim of the study was to develop a tool to identify P. vivax- infected patients that are at a higher risk of recurrence in Malaysia...
December 8, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29215331/a-comparative-transcriptomic-analysis-of-replicating-and-dormant-liver-stages-of-the-relapsing-malaria-parasite-plasmodium-cynomolgi
#7
Annemarie Voorberg-van der Wel, Guglielmo Roma, Devendra Kumar Gupta, Sven Schuierer, Florian Nigsch, Walter Carbone, Anne-Marie Zeeman, Boon Heng Lee, Sam O Hofman, Bart W Faber, Judith Knehr, Erica Pasini, Bernd Kinzel, Pablo Bifani, Ghislain M C Bonamy, Tewis Bouwmeester, Clemens H M Kocken, Thierry Tidiane Diagana
Plasmodium liver hypnozoites, which cause disease relapse, are widely considered to be the last barrier towards malaria eradication. The biology of this quiescent form of the parasite is poorly understood which hinders drug discovery. We report a comparative transcriptomic dataset of replicating liver schizonts and dormant hypnozoites of the relapsing parasite Plasmodium cynomolgi. Hypnozoites express only 34% of Plasmodium physiological pathways, while 91% are expressed in replicating schizonts. Few known malaria drug targets are expressed in quiescent parasites, but pathways involved in microbial dormancy, maintenance of genome integrity and ATP homeostasis were robustly expressed...
December 7, 2017: ELife
https://www.readbyqxmd.com/read/29182619/response-of-imported-malaria-patients-to-antimalarial-medicines-in-sri-lanka-following-malaria-elimination
#8
Priyani Dharmawardena, Chaturaka Rodrigo, Kamini Mendis, W M Kumudu T de A W Gunasekera, Risintha Premaratne, Pascal Ringwald, Deepika Fernando
After eliminating local malaria transmission and being certified as a malaria-free country, Sri Lanka is facing the challenge of imported malaria. At the same time, the country has the unique opportunity to be a case study for other countries in a similar situation by approaching this issue systematically, guided by evidence. This study demonstrates the importance of developing a mechanism to detect imported malaria and adopting an evidence-based approach to study the resistance of imported malaria to anti-malarial medicines...
2017: PloS One
https://www.readbyqxmd.com/read/29141760/glucose-6-phosphate-dehydrogenase-deficiency-genetic-variants-in-malaria-patients-in-southwestern-ethiopia
#9
Tamar E Carter, Seleshi Kebede Mekonnen, Karen Lopez, Victoria Bonnell, Lambodhar Damodaran, Abraham Aseffa, Daniel A Janies
Glucose-6-phosphate dehydrogenase (G6PD) deficiency is an X-linked erythrocyte enzyme disorder with relevance to malaria treatment policy. Treatment with the antimalarial primaquine can result in hemolytic anemia in G6PD-deficient patients. With increased interest in primaquine use, it is important to identify G6PD variants in Ethiopia to inform malaria treatment policy. In the present study, mutations in the G6PD gene are identified in a sample of patients with malaria in Jimma town in southwest Ethiopia. Plasmodium species of infection were confirmed using polymerase chain reaction (PCR) and gel electrophoresis...
October 30, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29141719/chloroquine-primaquine-versus-chloroquine-alone-to-treat-vivax-malaria-in-afghanistan-an-open-randomized-superiority-trial
#10
Ghulam Rahim Awab, Mallika Imwong, Germana Bancone, Atthanee Jeeyapant, Nicholas P J Day, Nicholas J White, Charles J Woodrow
Afghanistan's national guidelines recommend primaquine (PQ) for radical treatment of Plasmodium vivax malaria, but this is rarely implemented because of concerns over potential hemolysis in patients who have G6PD deficiency. Between August 2009 and February 2014, we conducted an open-label, randomized controlled trial of chloroquine (CQ) alone versus chloroquine plus primaquine (0.25 mg base/kg/day for 14 days) (CQ+PQ) in patients aged 6 months and older with microscopy confirmed P. vivax infection. In the CQ+PQ group, G6PD deficiency was excluded by fluorescent spot testing...
October 30, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29140229/epidemiology-of-imported-malaria-cases-in-japan-2006-2014-a-sentinel-traveler-surveillance-approach
#11
Atsuhiro Kanayama, Yuzo Arima, Tamano Matsui, Koki Kaku, Hitomi Kinoshita, Kazunori Oishi
Malaria continues to be imported into Japan. To better assess the risk of imported malaria, we describe malaria species, suspected country/area of infection (accounting for the number of travelers), demographic characteristics, clinical manifestation, and healthcare access, based on the national surveillance data from 2006 to 2014. Among 557 cases, the median age was 33 years (range: 1-83 years), and 76% were male; 306 (55%) were classified as Japanese based on the reported name. The majority were Plasmodium falciparum infections (58%), followed by Plasmodium vivax infections (30%)...
November 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29132978/intensive-care-in-severe-malaria-report-from-the-task-force-on-tropical-diseases-by-the-world-federation-of-societies-of-intensive-and-critical-care-medicine
#12
REVIEW
Dilip R Karnad, Mohd Basri Mat Nor, Guy A Richards, Tim Baker, Pravin Amin
Severe malaria is common in tropical countries in Africa, Asia, Oceania and South and Central America. It may also occur in travelers returning from endemic areas. Plasmodium falciparum accounts for most cases, although P vivax is increasingly found to cause severe malaria in Asia. Cerebral malaria is common in children in Africa, manifests as coma and seizures, and has a high morbidity and mortality. In other regions, adults may also develop cerebral malaria but neurological sequelae in survivors are rare...
November 8, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/29127021/severe-delayed-haemolytic-anaemia-associated-with-artemether-lumefantrine-treatment-of-malaria-in-a-japanese-traveller
#13
Chihiro Hasegawa, Masaharu Kudo, Haruhiko Maruyama, Mikio Kimura
Delayed haemolytic anaemia has been reported in association with intravenous artesunate treatment in patients with severe Plasmodium falciparum malaria, and furthermore, oral artemisinin-based combination therapies including artemether-lumefantrine (AL) have also been incriminated. However, definite cases of delayed haemolytic anaemia associated with AL appear to be scarce, as reported cases were often treated concomitantly with other anti-malarials. In this study, we report a severe case of delayed haemolytic anaemia following AL alone in a Japanese traveller with severe parasitaemia caused by numerous P...
November 7, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/29121061/a-randomized-double-blind-active-control-trial-to-evaluate-the-efficacy-and-safety-of-a-three-day-course-of-tafenoquine-monotherapy-for-the-treatment-of-plasmodium-vivax-malaria
#14
Mark M Fukuda, Srivicha Krudsood, Khadeeja Mohamed, Justin A Green, Sukhuma Warrasak, Harald Noedl, Ataya Euswas, Mali Ittiverakul, Nillawan Buathong, Sabaithip Sriwichai, R Scott Miller, Colin Ohrt
BACKGROUND: Tafenoquine is an investigational 8-aminoquinoline for the prevention of Plasmodium vivax relapse. Tafenoquine has a long half-life and the potential for more convenient dosing, compared with the currently recommended 14-day primaquine regimen. METHODS: This randomized, active-control, double-blind trial was conducted in Bangkok, Thailand. Seventy patients with microscopically confirmed P. vivax were randomized (2:1) to tafenoquine 400 mg once daily for 3 days or 2500 mg total dose chloroquine phosphate (1500 mg chloroquine base) given over 3 days plus primaquine 15 mg daily for 14 days...
2017: PloS One
https://www.readbyqxmd.com/read/29103261/population-genetics-of-plasmodium-vivax-in-four-high-malaria-endemic-areas-in-thailand
#15
Kanungnit Congpuong, Ratawan Ubalee
Recent trends of malaria in Thailand illustrate an increasing proportion of Plasmodium vivax, indicating the importance of P. vivax as a major causative agent of malaria. P. vivax malaria is usually considered a benign disease so the knowledge of this parasite has been limited, especially the genetic diversity and genetic structure of isolates from different endemic areas. The aim of this study was to examine the population genetics and structure of P. vivax isolates from 4 provinces with different malaria endemic settings in Thailand using 6 microsatellite markers...
October 2017: Korean Journal of Parasitology
https://www.readbyqxmd.com/read/29063526/malaria-cases-in-switzerland-from-2005-to-2015-and-recent-rise-of-imported-plasmodium-vivax-malaria
#16
Gilles Eperon, Sophie Durieux-Paillard, Anne Mauris, Fran├žois Chappuis, Nicole Gysin
Reporting cases of malaria to the Federal Office of Public Health has been mandatory in Switzerland since 1974. We analysed notifications of imported confirmed malaria cases between 2005 and 2015 in Switzerland or Liechtenstein. Data for previously visited countries, nationality and reason for travelling were analysed. In contrast with the impressive drop of malaria cases reported worldwide since 2000, we found that the number of malaria cases imported yearly in Switzerland doubled in 2014 and 2015 compared to the average for the preceding decade...
October 24, 2017: Swiss Medical Weekly
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
#17
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/29016341/prevalence-of-clinical-and-subclinical-plasmodium-falciparum-and-plasmodium-vivax-malaria-in-two-remote-rural-communities-on-the-china-myanmar-border
#18
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/29016333/distribution-of-mutations-associated-with-antifolate-and-chloroquine-resistance-among-imported-plasmodium-vivax-in-the-state-of-qatar
#19
Devendra Bansal, Anushree Acharya, Praveen K Bharti, Mohamed H Abdelraheem, Ashraf Elmalik, Salem Abosalah, Fahmi Y Khan, Mohamed ElKhalifa, Hargobinder Kaur, Pradyumna K Mohapatra, Rakesh Sehgal, Mohammed A Idris, Jagadish Mahanta, Neeru Singh, Hamza A Babiker, Ali A Sultan
Plasmodium vivax is the most prevalent parasite worldwide, escalating by spread of drug resistance. Currently, in Qatar, chloroquine (CQ) plus primaquine are recommended for the treatment of P. vivax malaria. The present study examined the prevalence of mutations in dihydrofolate reductase (dhfr), dihydropteroate synthase (dhps) genes and CQ resistance transporter (crt-o) genes, associated with sulphadoxine-pyrimethamine (SP) and chloroquine resistance, among imported P. vivax cases in Qatar. Blood samples were collected from patients positive for P...
October 2, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28984865/malaria-in-pregnancy-the-relevance-of-animal-models-for-vaccine-development
#20
Justin Doritchamou, Andrew Teo, Michal Fried, Patrick E Duffy
Malaria during pregnancy due to Plasmodium falciparum or P. vivax is a major public health problem in endemic areas, with P. falciparum causing the greatest burden of disease. Increasing resistance of parasites and mosquitoes to existing tools, such as preventive antimalarial treatments and insecticide-treated bed nets respectively, is eroding the partial protection that they offer to pregnant women. Thus, development of effective vaccines against malaria during pregnancy is an urgent priority. Relevant animal models that recapitulate key features of the pathophysiology and immunology of malaria in pregnant women could be used to accelerate vaccine development...
October 6, 2017: Lab Animal
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