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https://www.readbyqxmd.com/read/29445365/-babesia-microti-infection-changes-host-spleen-architecture-and-is-cleared-by-a-th1-immune-response
#1
Vitomir Djokic, Lavoisier Akoolo, Nikhat Parveen
Babesia microti is a malaria-like parasite, which infects ∼2000 people annually, such that babesiosis is now a notifiable disease in the United States. Immunocompetent individuals often remain asymptomatic and are tested only after they feel ill. Susceptible C3H/HeJ mice show several human-like disease manifestations and are ideal to study pathogenesis of Babesia species. In this study, we examined parasitemia of B. microti at different time points and assessed its impact on hemoglobin levels in blood, on spleen pathology and overall immune response in C3H/HeJ mice...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29422384/efficacy-and-safety-of-primaquine-and-methylene-blue-for-prevention-of-plasmodium-falciparum-transmission-in-mali-a-phase-2-single-blind-randomised-controlled-trial
#2
Alassane Dicko, Michelle E Roh, Halimatou Diawara, Almahamoudou Mahamar, Harouna M Soumare, Kjerstin Lanke, John Bradley, Koualy Sanogo, Daouda T Kone, Kalifa Diarra, Sekouba Keita, Djibrilla Issiaka, Sekou F Traore, Charles McCulloch, Will J R Stone, Jimee Hwang, Olaf Müller, Joelle M Brown, Vinay Srinivasan, Chris Drakeley, Roly Gosling, Ingrid Chen, Teun Bousema
BACKGROUND: Primaquine and methylene blue are gametocytocidal compounds that could prevent Plasmodium falciparum transmission to mosquitoes. We aimed to assess the efficacy and safety of primaquine and methylene blue in preventing human to mosquito transmission of P falciparum among glucose-6-phosphate dehydrogenase (G6PD)-normal, gametocytaemic male participants. METHODS: This was a phase 2, single-blind, randomised controlled trial done at the Clinical Research Centre of the Malaria Research and Training Centre (MRTC) of the University of Bamako (Bamako, Mali)...
February 5, 2018: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/29403652/high-level-of-specific-anti-plasmodium-falciparum-merozoite-igg1-antibodies-in-rural-asymptomatic-individuals-of-dienga-south-eastern-gabon
#3
Irène Pegha-Moukandja, Roméo-Karl Imboumy-Limoukou, Nina Tchitoula-Makaya, Augustin-Ghislain Mouinga-Ondeme, Jean Claude Biteghe-Bi-Essone, Dieudonne Nkoghe Mba, Jean-Bernard Lekana-Douki, Fousseyni S Toure Ndouo
Plasmodium falciparum merozoite antigens (PfMAgs) play an essential role in the development of immunity to malaria. Currently, P. falciparum: protein 113 (Pf 113), apical membrane antigen 1 (AMA1), erythrocyte binding antigens (EBA175), and reticulocyte binding protein homologue 5 (RH5) are among the most PfMAgs studied. A comparative analysis of naturally acquired antibodies against these antigens in children would increase our knowledge about the development of protective immunity. Analysis of antibodies to Pf113, PfAMA1, PfEBA175, and PfRH5 was conducted in rural population during 2013 and 2014...
December 18, 2017: European Journal of Microbiology & Immunology
https://www.readbyqxmd.com/read/29398388/the-persistence-and-oscillations-of-submicroscopic-plasmodium-falciparum-and-plasmodium-vivax-infections-over-time-in-vietnam-an-open-cohort-study
#4
Thuy-Nhien Nguyen, Lorenz von Seidlein, Tuong-Vy Nguyen, Phuc-Nhi Truong, Son Do Hung, Huong-Thu Pham, Tam-Uyen Nguyen, Thanh Dong Le, Van Hue Dao, Mavuto Mukaka, Nicholas Pj Day, Nicholas J White, Arjen M Dondorp, Guy E Thwaites, Tran Tinh Hien
BACKGROUND: A substantial proportion of Plasmodium species infections are asymptomatic with densities too low to be detectable with standard diagnostic techniques. The importance of such asymptomatic plasmodium infections in malaria transmission is probably related to their duration and density. To explore the duration of asymptomatic plasmodium infections and changes in parasite densities over time, a cohort of participants who were infected with Plasmodium parasites was observed over a 2-year follow-up period...
February 1, 2018: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/29398387/asymptomatic-low-density-malaria-infections-a-parasite-survival-strategy
#5
Anders B Björkman
No abstract text is available yet for this article.
February 1, 2018: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/29395998/treatment-of-uncomplicated-and-severe-malaria-during-pregnancy
#6
REVIEW
Umberto D'Alessandro, Jenny Hill, Joel Tarning, Christopher Pell, Jayne Webster, Julie Gutman, Esperanca Sevene
Over the past 10 years, the available evidence on the treatment of malaria during pregnancy has increased substantially. Owing to their relative ease of use, good sensitivity and specificity, histidine rich protein 2 based rapid diagnostic tests are appropriate for symptomatic pregnant women; however, such tests are less appropriate for systematic screening because they will not detect an important proportion of infections among asymptomatic women. The effect of pregnancy on the pharmacokinetics of antimalarial drugs varies greatly between studies and class of antimalarial drugs, emphasising the need for prospective studies in pregnant and non-pregnant women...
January 30, 2018: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/29394367/contribution-to-malaria-transmission-of-symptomatic-and-asymptomatic-parasite-carriers-in-cambodia
#7
Amélie Vantaux, Reingsey Samreth, Eak Por Piv, Nimol Khim, Saorin Kim, Laura Berne, Sophy Chy, Dysoley Lek, Sovannaroth Siv, Walter R Taylor, Didier Ménard
Background: Eliminating falciparum malaria in Cambodia is a top priority, requiring the implementation of novel tools and strategies to interrupt its transmission. To date, few data are available regarding the contributions to malaria transmission of symptomatic and asymptomatic carriers. Methods: Direct-membrane and skin feeding assays (DMFA, SFA) were performed, using Anopheles minimus and An. dirus, to determine infectivity of symptomatic falciparum-infected patients and malaria asymptomatic carriers; a subset of the latter were followed for two months to assess their transmission potential...
January 31, 2018: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29389671/a-controlled-human-malaria-infection-model-enabling-evaluation-of-transmission-blocking-interventions
#8
Katharine A Collins, Claire Yt Wang, Matthew Adams, Hayley Mitchell, Melanie Rampton, Suzanne Elliott, Isaie J Reuling, Teun Bousema, Robert Sauerwein, Stephan Chalon, Jörg J Möhrle, James S McCarthy
BACKGROUND: Drugs and vaccines that can interrupt the transmission of Plasmodium falciparum will be important for malaria control and elimination. However, models for early clinical evaluation of candidate transmission-blocking interventions are currently unavailable. Here we describe a new model for evaluating malaria transmission from humans to Anopheles mosquitoes using controlled human malaria infection (CHMI). METHODS: Seventeen healthy malaria-naïve volunteers underwent CHMI by intravenous inoculation of P...
February 1, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29378609/plasmodium-vivax-molecular-diagnostics-in-community-surveys-pitfalls-and-solutions
#9
REVIEW
Maria Gruenberg, Clara Antunes Moniz, Natalie Ellen Hofmann, Rahel Wampfler, Cristian Koepfli, Ivo Mueller, Wuelton Marcelo Monteiro, Marcus Lacerda, Gisely Cardoso de Melo, Andrea Kuehn, Andre M Siqueira, Ingrid Felger
A distinctive feature of Plasmodium vivax infections is the overall low parasite density in peripheral blood. Thus, identifying asymptomatic infected individuals in endemic communities requires diagnostic tests with high sensitivity. The detection limits of molecular diagnostic tests are primarily defined by the volume of blood analysed and by the copy number of the amplified molecular marker serving as the template for amplification. By using mitochondrial DNA as the multi-copy template, the detection limit can be improved more than tenfold, compared to standard 18S rRNA targets, thereby allowing detection of lower parasite densities...
January 30, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29361021/closing-in-on-the-reservoir-proactive-case-detection-in-high-risk-groups-as-a-strategy-to-detect-plasmodium-falciparum-asymptomatic-carriers-in-cambodia
#10
Gabriele Rossi, Lieven Vernaeve, Rafael Van den Bergh, Chea Nguon, Mark Debackere, Carme Abello Peiri, Vuthea Van, Nimol Khim, Saorin Kim, Rotha Eam, Malen Ken, Chanra Khean, Martin De Smet, Didier Menard, Jean-Marie Kindermans
Background: In the frame of elimination strategies of Plasmodium falciparum (Pf), active case detection has been recommended as complementary approach to the existing passive case detection programs. We trialed a polymerase chain reaction (PCR)-based active detection strategy targeting asymptomatic individuals, named proactive case detection (PACD), with the aim of assessing its feasibility, the extra yield of Pf infections, and the at-risk population for Pf carriage status. Methods: A pilot of PACD was conducted in 3 villages in Chey Saen district (Preah Vihear province, Cambodia), from December 2015 to March 2016...
January 18, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29357890/detection-of-asymptomatic-carriers-of-malaria-in-kohat-district-of-pakistan
#11
Muhammad Abdul Naeem, Suhaib Ahmed, Saleem Ahmed Khan
BACKGROUND: Kohat district is one of the medium intensity malaria transmission areas in Pakistan where asymptomatic carriers are likely to form a reservoir of infection. This study was done to explore the possibility of using microscopy, rapid diagnostic testing (RDT), real time polymerase chain reaction (RT-PCR) and RT-PCR followed by endpoint fluorometry (EPF) for detection of malaria in asymptomatic immediate family members of patients of malaria (homestead) and in a sample from the general population of Kohat...
January 22, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29353010/modulation-of-immune-responses-by-plasmodium-falciparum-infection-in-asymptomatic-children-living-in-the-endemic-region-of-mbita-western-kenya
#12
Caroline Kijogi, Daisuke Kimura, Lam Quoc Bao, Risa Nakamura, Evans Asena Chadeka, Ngetich Benard Cheruiyot, Felix Bahati, Kazuhide Yahata, Osamu Kaneko, Sammy M Njenga, Yoshio Ichinose, Shinjiro Hamano, Katsuyuki Yui
Individuals living in malaria endemic areas become clinically immune after multiple re-infections over time and remain infected without apparent symptoms. However, it is unclear why a long period is required to gain clinical immunity to malaria, and how such immunity is maintained. Although malaria infection is reported to induce inhibition of immune responses, studies on asymptomatic individuals living in endemic regions of malaria are relatively scarce. We conducted a cross-sectional study of immune responses in asymptomatic school children aged 4-16years living in an area where Plasmodium falciparum and Schistosoma mansoni infections are co-endemic in Kenya...
January 15, 2018: Parasitology International
https://www.readbyqxmd.com/read/29334956/identification-and-characterization-of-areas-of-high-and-low-risk-for-asymptomatic-malaria-infections-at-sub-village-level-in-ratanakiri-cambodia
#13
Lies Durnez, Myrthe Pareyn, Vanna Mean, Saorin Kim, Nimol Khim, Didier Menard, Marc Coosemans, Tho Sochantha, Vincent Sluydts
BACKGROUND: Malaria elimination needs a concentration of activities towards identification of residual transmission foci and intensification of efforts to eliminate the last few infections, located in so-called 'malaria hotspots'. Previous work on characterizing malaria transmission hotspots has mainly focused on falciparum malaria and especially on symptomatic cases, while the malaria reservoir is expected to be mainly concentrated in the asymptomatic human population when transmission is low...
January 15, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29332155/prevalence-of-the-pfdhfr-and-pfdhps-mutations-among-asymptomatic-pregnant-women-in-southeast-nigeria
#14
Ekpereonne Esu, Costanza Tacoli, Prabhanjan Gai, Nicole Berens-Riha, Michael Pritsch, Thomas Loescher, Martin Meremikwu
Sulfadoxine-pyrimethamine (SP) is the recommended drug for intermittent preventive treatment of malaria in pregnancy in most of sub-Saharan Africa. Resistance to SP is related to mutations in the dhfr and dhps gene of Plasmodium falciparum. This study determined the prevalence of Pfdhfr and Pfdhps polymorphisms found in asymptomatic pregnant women attending antenatal care in Calabar, Nigeria. From October 2013 to November 2014, asymptomatic pregnant women attending antenatal care clinics were enrolled after obtaining informed consent...
January 13, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29330980/comparison-of-efficacy-of-chloroquine-and-artemether-lumafantrine-in-treating-vivax-malaria-in-thall-and-surrounding-area
#15
Syed Mohammad Abrar, Syed Sajid Ali Shah, Raja Jibran Akbar, Sheema Rahim, Faizan Malik, Fakhar Uzzaman Khan
BACKGROUND: Fever is the main complaint in patients reporting to our hospital and the most common cause of fever in our set up is malaria. The aim of this study was to know about the clinical response, efficacy and resistance of vivax malaria to chloroquine in patients reporting to Thall Scouts Hospital. METHODS: All the adult male patients reporting to Thall Scouts Hospital with fever and other symptoms of malaria having slide positive vivax malaria were included in the study...
October 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/29324864/safety-of-single-low-dose-primaquine-in-glucose-6-phosphate-dehydrogenase-deficient-falciparum-infected-african-males-two-open-label-randomized-safety-trials
#16
Guido J H Bastiaens, Alfred B Tiono, Joseph Okebe, Helmi E Pett, Sam A Coulibaly, Bronner P Gonçalves, Muna Affara, Alphonse Ouédraogo, Edith C Bougouma, Guillaume S Sanou, Issa Nébié, John Bradley, Kjerstin H W Lanke, Mikko Niemi, Sodiomon B Sirima, Umberto d'Alessandro, Teun Bousema, Chris Drakeley
BACKGROUND: Primaquine (PQ) actively clears mature Plasmodium falciparum gametocytes but in glucose-6-phosphate dehydrogenase deficient (G6PDd) individuals can cause hemolysis. We assessed the safety of low-dose PQ in combination with artemether-lumefantrine (AL) or dihydroartemisinin-piperaquine (DP) in G6PDd African males with asymptomatic P. falciparum malaria. METHODS AND FINDINGS: In Burkina Faso, G6PDd adult males were randomized to treatment with AL alone (n = 10) or with PQ at 0...
2018: PloS One
https://www.readbyqxmd.com/read/29318942/high-prevalence-of-dihydrofolate-reductase-gene-mutations-in-plasmodium-falciparum-parasites-among-pregnant-women-in-nigeria-after-reported-use-of-sulfadoxine-pyrimethamine
#17
Olusola Ojurongbe, Christian N Nguetse, Samuel A Fayemiwo, Catherine O Falade, Taiwo A Ojurongbe, Bolaji N Thomas, Christian G Meyer, Thirumalaisamy P Velavan
This study assesses the prevalence of asymptomatic Plasmodium falciparum parasitemia positivity and P. falciparum dihydrofolate reductase (pfdhfr) mutations in parasite isolates among pregnant women in Southwest Nigeria. Plasmodium falciparum parasitemia was confirmed by microscopy and nested PCR in 200 pregnant women attending antenatal care. The prevalence of pfdhfr polymorphisms was determined by direct sequencing of the gene fragments containing the C50R, N51I, C59R, S108N, and I164L mutations. Information on the use of antimalarial drugs and methods applied to prevent malaria were obtained by a questionnaire...
January 10, 2018: Pathogens and Global Health
https://www.readbyqxmd.com/read/29316932/why-do-people-participate-in-mass-anti-malarial-administration-findings-from-a-qualitative-study-in-nong-district-savannakhet-province-lao-pdr-laos
#18
Bipin Adhikari, Koukeo Phommasone, Palingnaphone Kommarasy, Xayaphone Soundala, Phonesavanh Souvanthong, Tiengkham Pongvongsa, Gisela Henriques, Paul N Newton, Nicholas J White, Nicholas P J Day, Arjen M Dondorp, Lorenz von Seidlein, Mayfong Mayxay, Phaik Yeong Cheah, Christopher Pell
BACKGROUND: As a part of targeted malaria elimination (TME) in the Greater Mekong Sub-region (GMS), mass drug administration (MDA) with anti-malarials was conducted in four villages in Nong District, Savannakhet Province, Lao PDR (Laos). A high proportion of the target population participated in the MDA, with over 87% agreeing to take the anti-malarial. Drawing on qualitative data collected alongside the MDA, this article explores the factors that led to this high population coverage...
January 9, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29313573/p-vivax-malaria-presenting-as-thrombotic-microangiopathy
#19
Dharmendra Bhadauria, Harsh Vardhan, Anupma Kaul, Raj Kumar Sharma, Amit Gupta, Narayan Prasad, Manoj Jain
Introduction: Acute kidney injury (AKI) is reported to occur in patients with falciparum malaria but not uncommon with vivax malaria. AKI, anemia, thrombocytopenia and jaundice is a recurrent finding in severe malaria and can mimic as thrombotic microangiopathy (TMA). Relationship of malaria with TMA is unclear till date however evidences suggest their association. Methods & Material: We reviewed our electronic database to evaluate relationship of malaria with TMA, of cases of malaria, jaundice and AKI...
September 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/29313481/case-report-severe-plasmodium-vivax-malaria-mimicking-sepsis-in-a-neonate
#20
Suryadi N N Tatura, Elizabeth Clarissa Wowor, Jose M Mandei, Rocky Wilar, Sarah M Warouw, Johnny Rompis, Priscilla Kalensang, Joseph Tuda
Severe congenital malaria associated with Plasmodium vivax is uncommon. In Indonesia, most congenital malaria cases are due to Plasmodium falciparum infections. Most cases of congenital or neonatal malaria in endemic areas are diagnosed from peripheral smear as part of routine sepsis workup. Differentiating congenital and acquired neonatal malaria is very difficult. The case presented in this study describes severe P. vivax malaria with cholestatic jaundice and sepsis-like signs and symptoms in neonates. The mother was asymptomatic and the neonate was successfully treated with intravenous artesunate...
January 8, 2018: American Journal of Tropical Medicine and Hygiene
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