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https://www.readbyqxmd.com/read/29139004/progressive-multifocal-leukoencephalopathy-in-the-absence-of-immunosuppression
#1
Benjamin E Zucker, Sybil R L Stacpoole
A 69-year-old woman presented with a cortical hand syndrome progressing over several weeks. MRI brain showed characteristic appearances of progressive multifocal leukoencephalopathy (PML), confirmed by detection of the JC virus in CSF, despite the absence of any evidence of immunosuppression. Treatment with mirtazapine, mefloquine and cidofovir did not affect the progression of the disease, which was fatal within 7 months of presentation. This report adds to the small case literature that suggests that PML can occur in immunocompetent people, albeit extremely rarely...
November 14, 2017: Journal of Neurovirology
https://www.readbyqxmd.com/read/29127525/cellular-mechanisms-of-action-and-resistance-of-plasmodium-falciparum-to-artemisinin
#2
Papichaya Phompradit, Wanna Chaijaroenkul, Kesara Na-Bangchang
The recent reports of high failure rates and decline in in vitro sensitivity of Plasmodium falciparum to artemisinin-based combination therapies (ACTs) suggest the possibility of clinical artemisinin resistance along the Thai-Cambodian and Thai-Myanmar borders. The study investigated cellular mechanisms of action and resistance of P. falciparum to artesunate (stage specific activity, interaction with hemozoin, and anti-oxidant levels) in the two paired P. falciparum isolates (MSF046 and MSF060) collected before treatment with a 3-day artesunate-mefloquine and at the time of recrudescence...
November 10, 2017: Parasitology Research
https://www.readbyqxmd.com/read/29110709/the-prevalence-incidence-and-prevention-of-plasmodium-falciparum-infections-in-forest-rangers-in-bu-gia-map-national-park-binh-phuoc-province-vietnam-a-pilot-study
#3
Do Hung Son, Nguyen Thuy-Nhien, Lorenz von Seidlein, Truong Le Phuc-Nhi, Ngo Thi Phu, Nguyen Thi Kim Tuyen, Nguyen Huyen Tran, Nguyen Van Dung, Bui Van Quan, Nicholas P J Day, Arjen M Dondorp, Nicholas J White, Guy E Thwaites, Tran Tinh Hien
BACKGROUND: Prophylaxis for high-risk populations, such as forest workers, could be one component for malaria elimination in the Greater Mekong Sub-region. A study was conducted to assess the malaria incidence in forest rangers and the feasibility of malaria prophylaxis for rangers sleeping in forest camps. METHODS: Forest rangers deployed in the Bu Gia Map National Park, Vietnam were invited to participate in the study. Plasmodium infections were cleared using presumptive treatment, irrespective of malaria status, with a 3-day course dihydroartemisinin/piperaquine (DP) and a 14-day course of primaquine...
November 6, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29107173/deaths-and-parasuicides-associated-with-mefloquine-chemoprophylaxis-a-systematic-review
#4
REVIEW
Maya Tickell-Painter, Rachel Saunders, Nicola Maayan, Vittoria Lutje, Alberto Mateo-Urdiales, Paul Garner
BACKGROUND: Mefloquine is recommended in international health guidelines for preventing malaria in travellers. Reports of psychosis and suicide are often alluded to but are not clearly established. METHODS: We carried out a systematic review to identify and critically appraise any death or parasuicide associated with mefloquine prophylaxis. We developed a comprehensive search that included publications up to 11 July 2017. We included case studies but excluded newspaper reports...
October 25, 2017: Travel Medicine and Infectious Disease
https://www.readbyqxmd.com/read/29083100/mefloquine-for-preventing-malaria-during-travel-to-endemic-areas
#5
REVIEW
Maya Tickell-Painter, Nicola Maayan, Rachel Saunders, Cheryl Pace, David Sinclair
BACKGROUND: Mefloquine is one of four antimalarial agents commonly recommended for preventing malaria in travellers to malaria-endemic areas. Despite its high efficacy, there is controversy about its psychological side effects. OBJECTIVES: To summarize the efficacy and safety of mefloquine used as prophylaxis for malaria in travellers. SEARCH METHODS: We searched the Cochrane Infectious Diseases Group Specialized Register; the Cochrane Central Register of Controlled Trials (CENTRAL), published on the Cochrane Library; MEDLINE; Embase (OVID); TOXLINE (https://toxnet...
October 30, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29061758/praziquantel-targets-m1-macrophages-and-ameliorates-splenomegaly-in-chronic-schistosomiasis
#6
Delong Kong, Chunlei Zhou, Hongfei Guo, Wei Wang, Jingfan Qiu, Xinjian Liu, Jinfeng Liu, Lijuan Wang, Yong Wang
Splenomegaly is a common feature of many infectious diseases including schistosomiasis japonica. However, the immunopathogenesis and the treatment of splenomegaly due to schistosomiasis have been largely neglected. Praziquantel (PZQ), a classical schistosomicide, has been demonstrated to have anti-fibrotic and anti-inflammatory activities in schistosomiasis by us and others. In this study, we investigated the effect of PZQ on alleviating the splenomegaly caused by Schistosoma japonicum infection in mice. Results showed that the number of macrophages, especially the M1 macrophages, was significantly increased in the enlarged spleens of infected mice (P<0...
October 23, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29027504/pharmacokinetic-considerations-for-use-of-artemisinin-based-combination-therapies-against-falciparum-malaria-in-different-ethnic-populations
#7
REVIEW
Sri Riyati Sugiarto, Timothy M E Davis, Sam Salman
Artemisinin-based combination therapy (ACT) is used extensively as first-line treatment for uncomplicated falciparum malaria. There has been no rigorous assessment of the potential for racial/ethnic differences in the pharmacokinetic properties of ACTs that might influence their efficacy. Areas covered: A comprehensive literature search was performed that identified 72 publications in which the geographical origin of the patients could be ascertained and the key pharmacokinetic parameters maximum drug concentration (Cmax), area under the plasma concentration-time curve (AUC) and elimination half-life (t½β) were available for one or more of the five WHO-recommended ACTs (artemether-lumefantrine, artesunate-amodiaquine, artesunate-mefloquine, dihydroartemisinin-piperaquine and artesunate-sulfadoxine-pyrimethamine)...
November 2017: Expert Opinion on Drug Metabolism & Toxicology
https://www.readbyqxmd.com/read/28983468/increased-plasmodium-falciparum-parasitemia-in-non-splenectomized-saimiri-sciureus-monkeys-treated-with-clodronate-liposomes
#8
Janaiara A Cunha, Leonardo J M Carvalho, Cesare Bianco-Junior, Márcia C R Andrade, Lilian R Pratt-Riccio, Evelyn K P Riccio, Marcelo Pelajo-Machado, Igor J da Silva, Pierre Druilhe, Cláudio Tadeu Daniel-Ribeiro
A major constraint in the study of Plasmodium falciparum malaria, including vaccine development, lies on the parasite's strict human host specificity and therefore the shortage of animal experimental models able to harbor human plasmodia. The best experimental models are neo-tropical primates of the genus Saimiri and Aotus, but they require splenectomy to reduce innate defenses for achieving high and consistent parasitemias, an important limitation. Clodronate-liposomes (CL) have been successfully used to deplete monocytes/macrophages in several experimental models...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28971860/immunohistochemical-investigations-of-treatment-with-ro-13-3978-praziquantel-oxamniquine-and-mefloquine-in-schistosoma-mansoni-infected-mice
#9
Gordana Panic, Marie-Thérèse Ruf, Jennifer Keiser
To date there is only one drug in use, praziquantel, to treat more than 250 million people afflicted with schistosomiasis, a debilitating parasitic disease. The aryl hydantoin Ro 13-3978 is a promising drug candidate with superior in vivo activity to praziquantel against both adult and juvenile Schistosoma mansoni Given the drugs' contrasting low activity in vitro, and the timing of its onset of action in vivo, it was postulated that immune-assisted parasite clearance could contribute to the drug's in vivo activity...
October 2, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28964258/measuring-ex-vivo-drug-susceptibility-in-plasmodium-vivax-isolates-from-cambodia
#10
Suwanna Chaorattanakawee, Chanthap Lon, Soklyda Chann, Kheang Heng Thay, Nareth Kong, Yom You, Siratchana Sundrakes, Chatchadaporn Thamnurak, Sorayut Chattrakarn, Chantida Praditpol, Kritsanai Yingyuen, Mariusz Wojnarski, Rekol Huy, Michele D Spring, Douglas S Walsh, Jaymin C Patel, Jessica Lin, Jonathan J Juliano, Charlotte A Lanteri, David L Saunders
BACKGROUND: While intensive Plasmodium falciparum multidrug resistance surveillance continues in Cambodia, relatively little is known about Plasmodium vivax drug resistance in Cambodia or elsewhere. To investigate P. vivax anti-malarial susceptibility in Cambodia, 76 fresh P. vivax isolates collected from Oddar Meanchey (northern Cambodia) in 2013-2015 were assessed for ex vivo drug susceptibility using the microscopy-based schizont maturation test (SMT) and a Plasmodium pan-species lactate dehydrogenase (pLDH) ELISA...
September 30, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28939502/malaria-prevention-recommendations-for-risk-groups-visiting-sub-saharan-africa-a-survey-of-european-expert-opinion-and-international-recommendations
#11
Mithula Shellvarajah, Christoph Hatz, Patricia Schlagenhauf
INTRODUCTION: Malaria prevention can be complex due to the individual characteristics of the traveller, travel destination, duration of stay and type of travel. Our aim in this study was to document malaria chemoprophylaxis recommendations provided by travel-medicine experts in Europe for specific risk groups of travellers visiting malaria-endemic areas of sub-Saharan Africa. METHODS: Travel medicine experts in Europe were asked to complete an online questionnaire, a 28-item Survey Monkey survey, on 11 malaria prevention scenarios...
September 19, 2017: Travel Medicine and Infectious Disease
https://www.readbyqxmd.com/read/28931142/malaria-prevention-strategies-and-recommendations-from-chemoprophylaxis-to-stand-by-emergency-treatment-a-10-year-prospective-study-in-a-swiss-travel-clinic
#12
Rim Boubaker, Annie Hérard Fossati, Pierrette Meige, Catherine Mialet, Chantal Ngarambe Buffat, Jacynthe Rochat, Manisinh Souvannaraj-Blanchant, Mediatrice Uwanyiligira, Francine Widmer, Sylvie Payot, Laurence Rochat, Serge de Vallière, Valérie D'Acremont, Blaise Genton
Background: There are several possible malaria prevention strategies for travellers. In Switzerland, chemoprophylaxis (CP) is recommended for persons visiting areas highly endemic for malaria and stand-by emergency treatment (SBET) for areas with moderate to low risk. Objective: To describe the type of malaria prevention prescribed to travel clinic attendees with a specific focus on changes over time following adaptation of recommendations. Methods: All pre-travel first consultation data recorded between November 2002 and December 2012 were included...
September 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28923866/changing-antimalarial-drug-sensitivities-in-uganda
#13
Stephanie A Rasmussen, Frida G Ceja, Melissa D Conrad, Patrick K Tumwebaze, Oswald Byaruhanga, Thomas Katairo, Samuel L Nsobya, Philip J Rosenthal, Roland A Cooper
Dihydroartemisinin-piperaquine (DP) has demonstrated excellent efficacy for the treatment and prevention of malaria in Uganda. However, resistance to both components of this regimen has emerged in Southeast Asia. The efficacy of artemether-lumefantrine, the first-line regimen to treat malaria in Uganda, has also been excellent, but continued pressure may select for parasites with decreased sensitivity to lumefantrine. To gain insight into current drug sensitivity patterns, ex vivo sensitivities were assessed and genotypes previously associated with altered drug sensitivity were characterized for 58 isolates collected in Tororo, Uganda from subjects presenting in 2016 with malaria from the community or as part of a clinical trial comparing DP chemoprevention regimens...
September 18, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28895080/population-pharmacokinetic-and-pharmacodynamic-modeling-of-artemisinin-resistance-in-southeast-asia
#14
Jesmin Lohy Das, Arjen M Dondorp, Francois Nosten, Aung Pyae Phyo, Warunee Hanpithakpong, Pascal Ringwald, Pharath Lim, Nicholas J White, Mats O Karlsson, Martin Bergstrand, Joel Tarning
Orally administered artemisinin-based combination therapy is the first-line treatment against uncomplicated P. falciparum malaria worldwide. However, the increasing prevalence of artemisinin resistance is threatening efforts to treat and eliminate malaria in Southeast Asia. This study aimed to characterize the exposure-response relationship of artesunate in patients with artemisinin sensitive and resistant malaria infections. Patients were recruited in Pailin, Cambodia (n = 39), and Wang Pha, Thailand (n = 40), and received either 2 mg/kg/day of artesunate mono-therapy for 7 consecutive days or 4 mg/kg/day of artesunate monotherapy for 3 consecutive days followed by mefloquine 15 and 10 mg/kg for 2 consecutive days...
November 2017: AAPS Journal
https://www.readbyqxmd.com/read/28894322/implications-of-changes-to-the-mefloquine-product-monograph
#15
Remington L Nevin
No abstract text is available yet for this article.
July 2017: Canadian Journal of Hospital Pharmacy
https://www.readbyqxmd.com/read/28879898/progressive-multifocal-leukoencephalopathy-in-a-44-year-old-male-with-idiopathic-cd4-t-lymphocytopenia-treated-with-mirtazapine-and-mefloquine
#16
Aruna Nambirajan, Vaishali Suri, Vijay Kataria, Mehar C Sharma, Vinay Goyal
Progressive multifocal leukoencephalopathy (PML) is an opportunistic viral infection of the central nervous system caused by the reactivation of John Cunningham virus (JCV) in immunocompromised patients, most commonly in human immunodeficiency virus (HIV) infection, and less commonly in those receiving various immunosuppressive regimens. Prognosis of untreated PML is grave and the mainstay of treatment is the reversal of immunosuppression, usually by institution of antiretroviral drugs in HIV patients and cessation of immunosuppressive therapies in others...
September 2017: Neurology India
https://www.readbyqxmd.com/read/28874682/hydrogen-peroxide-dynamics-in-subcellular-compartments-of-malaria-parasites-using-genetically-encoded-redox-probes
#17
Mahsa Rahbari, Stefan Rahlfs, Jude M Przyborski, Anna Katharina Schuh, Nicholas H Hunt, David A Fidock, Georges E Grau, Katja Becker
Redox balance is essential for the survival, growth and multiplication of malaria parasites and oxidative stress is involved in the mechanism of action of many antimalarial drugs. Hydrogen peroxide (H2O2) plays an important role in redox signalling and pathogen-host cell interactions. For monitoring intra- and subcellular redox events, highly sensitive and specific probes are required. Here, we stably expressed the ratiometric H2O2 redox sensor roGFP2-Orp1 in the cytosol and the mitochondria of Plasmodium falciparum (P...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28864033/characterising-the-effect-of-antimalarial-drugs-on-the-maturation-and-clearance-of-murine-blood-stage-plasmodium-parasites-in-vivo
#18
David S Khoury, Deborah Cromer, Trish Elliott, Megan S F Soon, Bryce S Thomas, Kylie R James, Shannon E Best, Rosemary A Aogo, Jessica A Engel, Kate H Gartlan, Jasmin Akter, Ismail Sebina, Ashraful Haque, Miles P Davenport
The artemisinins are the first-line therapy for severe and uncomplicated malaria, since they cause rapid declines in parasitemia after treatment. Despite this, in vivo mechanisms underlying this rapid decline remain poorly characterised. The overall decline in parasitemia is the net effect of drug inhibition of parasites and host clearance, which competes against any ongoing parasite proliferation. Separating these mechanisms in vivo was not possible through measurements of total parasitemia alone. Therefore, we employed an adoptive transfer approach in which C57BL/6J mice were transfused with Plasmodium berghei ANKA strain-infected, fluorescent red blood cells, and subsequently drug-treated...
August 31, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28859963/in-vitro-effects-of-amino-alcohols-on-echinococcus-granulosus
#19
Congshan Liu, Jianhai Yin, Jian Xue, Yi Tao, Wei Hu, Haobing Zhang
Cystic echinococcosis is a globally distributed zoonotic disease, which is caused by the larval stage of Echinococcosus granulosus sensu lato. The chemotherapy of the disease is limited to the use of benzimidazoles. Recently, mefloquine and its analogues, aminoalcohol-carbazole, and some amino alcohol derivatives were reported to display inhibitory effects on parasites. Here, the activities of 130 amino alcohol compounds against E. granulosus were tested on protoscoleces and germinal cells at a concentration of 20μg/ml over a period of three days...
August 28, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28854635/partner-drug-resistance-and-population-substructuring-of-artemisinin-resistant-plasmodium-falciparum-in-cambodia
#20
Christian M Parobek, Jonathan B Parr, Nicholas F Brazeau, Chanthap Lon, Suwanna Chaorattanakawee, Panita Gosi, Eric J Barnett, Lauren D Norris, Steven R Meshnick, Michele D Spring, Charlotte A Lanteri, Jeffrey A Bailey, David L Saunders, Jessica T Lin, Jonathan J Juliano
Plasmodium falciparum in western Cambodia has developed resistance to artemisinin and its partner drugs, causing frequent treatment failure. Understanding this evolution can inform the deployment of new therapies. We investigated the genetic architecture of 78 falciparum isolates using whole-genome sequencing, correlating results to in vivo and ex vivo drug resistance and exploring the relationship between population structure, demographic history, and partner drug resistance. Principle component analysis, network analysis and demographic inference identified a diverse central population with three clusters of clonally expanding parasite populations, each associated with specific K13 artemisinin resistance alleles and partner drug resistance profiles which were consistent with the sequential deployment of artemisinin combination therapies in the region...
June 1, 2017: Genome Biology and Evolution
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