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https://www.readbyqxmd.com/read/28451034/free-living-amoebae-isolated-in-the-central-african-republic-epidemiological-and-molecular-aspects
#1
Alain Farra, Claudine Bekondi, Vianney Tricou, Jean Robert Mbecko, Antoine Talarmin
Among the many species of free-living amoebae infecting humans, only Naegleria fowleri, a few species of Acanthamoeba, Balamuthia mandrillaris recently Sappinia diploïdea and Paravahlkampfia Francina are responsible for human diseases especially deadly encephalitis outside of Acanthamoeba keratitis related. In the Central African Republic (CAR), no studies have previously been conducted about free amoebae and no suspicious cases of encephalitis or amoebic keratitis was reported even though the ecosystem supported the proliferation of these microorganisms...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28426408/isolation-and-molecular-characterization-of-a-naegleria-strain-from-a-recreational-water-fountain-in-tenerife-canary-islands-spain
#2
María Reyes-Batlle, Carolina Wagner, Atteneri López-Arencibia, Ines Sifaoui, Enrique Martínez-Carretero, Basilio Valladares, Jose E Piñero, Jacob Lorenzo-Morales
Free-Living Amoebae (FLA) are widely distributed protozoa in the environment and have been isolated from many sources such as dust, soil and water. Among the pathogenic genera included in this group Acanthamoeba spp., Naegleria fowleri and Balamuthia mandrillaris have been reported to be causative agents of lethal encephalitis, disseminated infections and keratitis. Naegleria fowleri is a pathogenic FLA species which causes Primary Amoebic Meningoencephalitis (PAM). At present there are not many available data on the distribution of Naegleria species in Spain from environmental sources...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28404683/brain-eating-amoebae-predilection-sites-in-the-brain-and-disease-outcome
#3
Timothy Yu Yee Ong, Naveed Ahmed Khan, Ruqaiyyah Siddiqui
Acanthamoeba spp. and Balamuthia mandrillaris are causative agents of granulomatous amoebic encephalitis (GAE), while Naegleria fowleri causes primary amoebic meningoencephalitis (PAM). PAM is an acute infection lasting few days, while GAE is a chronic to subacute infection that can last up to several months. Here, we present a literature review of 86 case reports from 1968 to 2016 in order to explore affinity of these amoebae towards particular sites of the brain, diagnostic modalities, treatment options and the disease outcome in a comparative manner...
April 12, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28390237/methodological-approaches-for-monitoring-opportunistic-pathogens-in-premise-plumbing-a-review
#4
REVIEW
Hong Wang, Emilie Bédard, Michèle Prévost, Anne K Camper, Vincent R Hill, Amy Pruden
Opportunistic premise (i.e., building) plumbing pathogens (OPPPs, e.g., Legionella pneumophila, Mycobacterium avium complex, Pseudomonas aeruginosa, Acanthamoeba, and Naegleria fowleri) are a significant and growing source of disease. Because OPPPs establish and grow as part of the native drinking water microbiota, they do not correspond to fecal indicators, presenting a major challenge to standard drinking water monitoring practices. Further, different OPPPs present distinct requirements for sampling, preservation, and analysis, creating an impediment to their parallel detection...
June 15, 2017: Water Research
https://www.readbyqxmd.com/read/28389055/primary-amebic-meningoencephalitis-in-children-a-report-of%C3%A2-two-fatal-cases-and-review-of-the-literature
#5
Robert C Stowe, Davut Pehlivan, Katie E Friederich, Michael A Lopez, Shannon M DiCarlo, Varina L Boerwinkle
BACKGROUND: Primary amebic meningoencephalitis is a rare, almost uniformly fatal disease of cerebral invasion by Naegleria fowleri, occurring most commonly after swimming in warm fresh water in summer months. Treatment using the experimental medication miltefosine demonstrated improved survival and favorable neurocognitive outcome in a 2013 North American patient. Little has been described regarding electrographic recordings of such patients, and little is known to compare known pediatric cases of survival...
February 22, 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/28348761/fatal-primary-amoebic-meningoencephalitis-in-a-norwegian-tourist-returning-from-thailand
#6
Tore Taksdal Stubhaug, Olaug Marie Reiakvam, Christen Rune Stensvold, Nils Olav Hermansen, Mona Holberg-Petersen, Ellen-Ann Antal, Knut Gaustad, Ingrid Schage Førde, Bernt Heger
INTRODUCTION: Primary amoebic meningoencephalitis (PAM) is a rare disease caused by the free-living amoeba Naegleria fowleri. Infection occurs by insufflation of water containing amoebae into the nasal cavity, and is usually associated with bathing in freshwater. Nasal irrigation is a more rarely reported route of infection. CASE PRESENTATION: A fatal case of PAM in a previously healthy Norwegian woman, acquired during a holiday trip to Thailand, is described. Clinical findings were consistent with rapidly progressing meningoencephalitis...
June 2016: JMM Case Reports
https://www.readbyqxmd.com/read/28334109/comparison-of-biofilm-ecology-supporting-growth-of-individual-naegleria-species-in-a-drinking-water-distribution-system
#7
Geoffrey J Puzon, Jason T Wylie, Tom Walsh, Kalan Braun, Matthew J Morgan
Free-living amoebae (FLA) are common components of microbial communities in drinking water distribution systems (DWDS). FLA are of clinical importance both as pathogens and as reservoirs for bacterial pathogens, so identifying the conditions promoting amoebae colonisation of DWDSs is an important public health concern for water utilities. We used high-throughput amplicon sequencing to compare eukaryotic and bacterial communities associated with DWDS biofilms supporting distinct FLA species (Naegleria fowleri, N...
April 1, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28290675/development-of-untargeted-metabolomics-methods-for-the-rapid-detection-of-pathogenic-naegleria-fowleri
#8
Zhihao Yu, Haylea C Miller, Geoffrey J Puzon, Brian H Clowers
Despite comparatively low levels of infection, primary amoebic meningoencephalitis (PAM) induced by Naegleria fowleri is extremely lethal, with mortality rates above 95%. As a thermophile, this organism is often found in moderate-to-warm climates and has the potential to colonize drinking water distribution systems (DWDSs). Current detection approaches require days to obtain results, whereas swift corrective action can maximize the benefit of public health. Presently, there is little information regarding the underlying in situ metabolism for this amoeba but the potential exists to exploit differentially expressed metabolic signatures as a rapid detection technique...
April 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28225265/targeting-brain-eating-amoebae-infections
#9
Naveed Ahmed Khan, Timothy Yu Yee Ong, Ruqaiyyah Siddiqui
Brain infections due to Acanthamoeba spp., Balamuthia mandrillaris, and Naegleria fowleri often lead to death. Despite differences in the preferential sites of infection in the brain, the mode of delivery of drugs is often intravenous. Here, we discuss targeted therapeutic approach to affect parasite viability without affecting the host cells, with an eye to improve formulation of drugs and/or administration of drugs against brain-eating amoebae.
April 19, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28224696/can-contaminated-water-be-rendered-safe-for-nasal-saline-irrigations
#10
Allison G Ordemann, James K Stanford, Donna C Sullivan, J Mark Reed
OBJECTIVES/HYPOTHESIS: To compare sterile water to three methods of sterilization (carbon filtration, boiling, and ultraviolet [UV] light) for preparation of nasal saline irrigants free of bacterial and amebic contaminants. STUDY DESIGN: Bench-top translational research and cost comparison. METHODS: Sterile water was compared to common sterilization methods. Sterile water was contaminated with known concentrations of Staphylococcus aureus, Pseudomonas aeruginosa, Moraxella catarrhalis, Acinetobacter baumannii, Klebsiella pneumonia, Legionella pneumophila, and Naegleria fowleri...
February 22, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28030337/occurrence-of-naegleria-species-in-therapeutic-geothermal-water-sources-northern-iran
#11
Ali Reza Latifi, Maryam Niyyati, Jacob Lorenzo-Morales, Ali Haghighi, Seyyed Javad Seyyed Tabaei, Zohreh Lasjerdi, Eznolah Azargashb
Potentially pathogenic Free-Living Amoebae include members belonging to Naegleria genus. The species N. fowleri is known worldwide as the causative agent of the lethal Primary Amoebic Meningoencephalitis (PAM). Only one clinical case of N. fowleri has been reported in Iran. Several species of Naegleria have been reported to be natural carriers of other potentially pathogenic microbial agents. The thermotolerance properties of this genus facilitates their presence in geothermal water sources including hot springs and spas...
March 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28013053/surviving-naegleria-fowleri-infections-a-successful-case-report-and-novel-therapeutic-approach
#12
Travis W Heggie, Thomas Küpper
Naegleria fowleri is a deadly human pathogen recognized as the causative agent of Primary Amoebic Meningitis (PAM). N. fowleri is commonly found in warm freshwater environments such as natural or man-made lakes, hot springs, and resort spas frequented by tourists. PAM infections have a mortality rate between 95 and 99% with minimal progress being made toward a successful treatment therapy. We report the case of a 12-year old American female who survived a PAM infection and propose a new drug therapy which includes the antimicrobial drug Miltefosine...
March 2017: Travel Medicine and Infectious Disease
https://www.readbyqxmd.com/read/27974249/elimination-of-naegleria-fowleri-from-bulk-water-and-biofilm-in-an-operational-drinking-water-distribution-system
#13
Haylea C Miller, Matthew J Morgan, Jason T Wylie, Anna H Kaksonen, David Sutton, Kalan Braun, Geoffrey J Puzon
Global incidence of primary amoebic meningoencephalitis cases associated with domestic drinking water is increasing. The need for understanding disinfectant regimes capable of eliminating the causative microorganism, Naegleria fowleri, from bulk water and pipe wall biofilms is critical. This field study demonstrated the successful elimination of N. fowleri from the bulk water and pipe wall biofilm of a persistently colonised operational drinking water distribution system (DWDS), and the prevention of further re-colonisation...
March 1, 2017: Water Research
https://www.readbyqxmd.com/read/27867026/artemisinin-and-its-derivatives-in-treating-protozoan-infections-beyond-malaria
#14
REVIEW
Cecilia Shi Ni Loo, Nelson Siu Kei Lam, Deying Yu, Xin-Zhuan Su, Fangli Lu
Parasitic protozoan diseases continue to rank among the world's greatest global health problems, which are also common among poor populations. Currently available drugs for treatment present drawbacks, urging the need for more effective, safer, and cheaper drugs. Artemisinin (ART) and its derivatives are some of the most important classes of antimalarial agents originally derived from Artemisia annua L. However, besides the outstanding antimalarial and antischistosomal activities, ART and its derivatives also possess activities against other parasitic protozoa...
November 17, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27796560/ubiquitin-like-atg8-protein-is-expressed-during-autophagy-and-the-encystation-process-in-naegleria-gruberi
#15
Roberto Cárdenas-Zúñiga, Virginia Sánchez-Monroy, Rosa María Bermúdez-Cruz, Mario Alberto Rodríguez, Jesús Serrano-Luna, Mineko Shibayama
Members of the Naegleria genus are free-living amoebae, and the only pathogenic specie described to date for humans is N. fowleri. However, as the complete genome of this specie has not been reported, non-pathogenic N. gruberi is employed to describe molecular pathways in N. fowleri. Regardless, certain mechanisms, such as autophagy, have not yet been characterized in N. gruberi. Autophagy is involved in different cellular processes in some protozoa, including the recycling of unnecessary organelles, development, and cell differentiation...
January 2017: Parasitology Research
https://www.readbyqxmd.com/read/27772819/primary-amoebic-meningoencephalitis-in-north-queensland-the-diagnostic-challenges-of-naegleria-fowleri
#16
Fiona Parsonson, Claire Nicholls
No abstract text is available yet for this article.
February 2016: Pathology
https://www.readbyqxmd.com/read/27730363/coexistence-of-free-living-amoebae-and-bacteria-in-selected-south-african-hospital-water-distribution-systems
#17
P Muchesa, M Leifels, L Jurzik, K B Hoorzook, T G Barnard, C Bartie
Pathogenic free-living amoebae (FLA), such as Naegleria fowleri, Balamuthia mandrillaris and Acanthamoeba species isolated from aquatic environments have been implicated in central nervous system, eye and skin human infections. They also allow the survival, growth and transmission of bacteria such as Legionella, Mycobacteria and Vibrio species in water systems. The purpose of this study was to investigate the co-occurrence of potentially pathogenic FLA and their associated bacteria in hospital water networks in Johannesburg, South Africa...
January 2017: Parasitology Research
https://www.readbyqxmd.com/read/27724947/molecular-detection-of-acanthamoeba-spp-naegleria-fowleri-and-vermamoeba-hartmannella-vermiformis-as-vectors-for-legionella-spp-in-untreated-and-solar-pasteurized-harvested-rainwater
#18
Penelope H Dobrowsky, Sehaam Khan, Thomas E Cloete, Wesaal Khan
BACKGROUND: Legionella spp. employ multiple strategies to adapt to stressful environments including the proliferation in protective biofilms and the ability to form associations with free-living amoeba (FLA). The aim of the current study was to identify Legionella spp., Acanthamoeba spp., Vermamoeba (Hartmannella) vermiformis and Naegleria fowleri that persist in a harvested rainwater and solar pasteurization treatment system. METHODS: Pasteurized (45 °C, 65 °C, 68 °C, 74 °C, 84 °C and 93 °C) and unpasteurized tank water samples were screened for Legionella spp...
October 10, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27681975/primary-amoebic-meningoencephalitis-in-north-queensland-the-paediatric-experience
#19
REVIEW
Claire L Nicholls, Fiona Parsonson, Lawrence Ek Gray, Adele Heyer, Steven Donohue, Greg Wiseman, Robert Norton
Primary amoebic meningoencephalitis (PAM) is a fulminant, diffuse haemorrhagic meningoencephalitis caused by Naegleria fowleri, with an almost invariably fatal outcome. In Australia and the developed world, PAM remains a rare disease, although it is very likely that large numbers of cases go undetected in developing countries. N. fowleri is a thermophilic, free-living amoeba with a worldwide distribution. It is acquired when contaminated fresh water is flushed into the nose and penetrates the central nervous system via the cribriform plate...
October 3, 2016: Medical Journal of Australia
https://www.readbyqxmd.com/read/27616699/biology-and-pathogenesis-of-naegleria-fowleri
#20
REVIEW
Ruqaiyyah Siddiqui, Ibne Karim M Ali, Jennifer R Cope, Naveed Ahmed Khan
Naegleria fowleri is a protist pathogen that can cause lethal brain infection. Despite decades of research, the mortality rate related with primary amoebic meningoencephalitis owing to N. fowleri remains more than 90%. The amoebae pass through the nose to enter the central nervous system killing the host within days, making it one of the deadliest opportunistic parasites. Accordingly, we present an up to date review of the biology and pathogenesis of N. fowleri and discuss needs for future research against this fatal infection...
December 2016: Acta Tropica
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