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Buruli Ulcer

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https://www.readbyqxmd.com/read/29181205/basidiobolomycosis-simulating-a-mycobacterium-ulcerans-infection-in-a-togolese-rural-child
#1
Bayaki Saka, Waguena Gnassingbe, Garba Mahamadou, Sefako Akakpo, Julienne Teclessou, Aurel Abilogun-Chokki, Abas Mouhari-Toure, Koussake Kombate, Palokinam Pitché
Background: Basidiobolomycosis is a deep mycosis which preferentially affects rural young people in tropical countries. We report an atypical case, with multiple ulcers, simulating a Buruli ulcer. Case Report: A 5-year-old boy, living in a rural area, was seen for ulcers on the buttocks and at the back and right flank that had been in progress for 4 months. On examination, we found an infiltrated plaque with sharp edges, little painful, located on the buttocks, back, and the right flank...
2017: Case Reports in Dermatological Medicine
https://www.readbyqxmd.com/read/29155010/intra-amoebal-killing-of-mycobacterium-ulcerans-by-acanthamoeba-griffini-a-co-culture-model
#2
Amar Bouam, Eric Ghigo, Michel Drancourt
Mycobacterium ulcerans, a decaying Mycobacterium marinum derivative is responsible for Buruli ulcer, a notifiable non-contagious disabling infection highly prevalent in some West African countries. Aquatic environments are suspected to host M. ulcerans, however, the exact reservoirs remain unknown. While M. marinum was found to resist amoebal microbicidal activities, this remains unknown for M. ulcerans. In this study M. ulcerans was co-cultured with the moderately halophile Acanthamoeba griffini at 30 °C to probe this tropical amoeba as a potential reservoir for M...
November 17, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29148373/mycobacterium-ulcerans-dna-in-bandicoot-excreta-in-buruli-ulcer-endemic-area-northern-queensland-australia
#3
Katharina Röltgen, Gerd Pluschke, Paul D R Johnson, Janet Fyfe
To identify potential reservoirs/vectors of Mycobacterium ulcerans in northern Queensland, Australia, we analyzed environmental samples collected from the Daintree River catchment area, to which Buruli ulcer is endemic, and adjacent coastal lowlands by species-specific PCR. We detected M. ulcerans DNA in soil, mosquitoes, and excreta of bandicoots, which are small terrestrial marsupials.
December 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29137663/patent-landscape-of-neglected-tropical-diseases-an-analysis-of-worldwide-patent-families
#4
Folahanmi Tomiwa Akinsolu, Vitor Nobre de Paiva, Samuel Santos Souza, Orsolya Varga
BACKGROUND: "Neglected Tropical Diseases" (NTDs) affect millions of people in Africa, Asia and South America. The two primary ways of strategic interventions are "preventive chemotherapy and transmission control" (PCT), and "innovative and intensified disease management" (IDM). In the last 5 years, phenomenal progress has been achieved. However, it is crucial to intensify research effort into NTDs, because of the emerging drug resistance. According to the World Health Organization (WHO), the term NTDs covers 17 diseases, namely buruli ulcer, Chagas disease, dengue, dracunculiasis, echinococcosis, trematodiasis, human African trypanosomiasis, leishmaniasis, leprosy, lymphatic filariasis, onchocerciasis, rabies, schistosomiasis, soil-transmitted helminthes, taeniasis, trachoma, and yaws...
November 14, 2017: Globalization and Health
https://www.readbyqxmd.com/read/29057458/support-needs-of-people-living-with-mycobacterium-ulcerans-buruli-ulcer-disease-in-a-ghana-rural-community-a-grounded-theory-study
#5
Alex Effah, Steven J Ersser, Ann Hemingway
INTRODUCTION/BACKGROUND: Mycobacterium ulcerans (also known as Buruli ulcer) disease is a rare skin disease which is prevalent in rural communities in the tropics mostly in Africa. Mortality rate is low, yet morbidity and consequent disabilities affect the quality of life of sufferers. AIMS: The aim of this paper is to use the grounded theory method to explore the support needs of people living with the consequences of Buruli ulcer in an endemic rural community in Ghana...
October 23, 2017: International Journal of Dermatology
https://www.readbyqxmd.com/read/29046669/susceptibility-to-mycobacterium-ulcerans-disease-buruli-ulcer-is-associated-with-ifng-and-inos-gene-polymorphisms
#6
Stéphanie Bibert, Martin W Bratschi, Samuel Y Aboagye, Emilie Collinet, Nicole Scherr, Dorothy Yeboah-Manu, Christian Beuret, Gerd Pluschke, Pierre-Yves Bochud
Buruli ulcer (BU) is a chronic necrotizing disease of the skin and subcutaneous fat tissue. The causative agent, Mycobacterium ulcerans, produces mycolactone, a macrolide toxin, which causes apoptosis of mammalian cells. Only a small proportion of individuals exposed to M. ulcerans develop clinical disease, as surrounding macrophages may control the infection by bacterial killing at an early stage, while mycolactone concentration is still low. Otherwise, bacterial multiplication leads to in higher concentrations of mycolactone, with formation of necrotizing lesions that are no more accessible to immune cells...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28980523/increased-severity-and-spread-of-mycobacterium-ulcerans-southeastern-australia
#7
Alex Y C Tai, Eugene Athan, N Deborah Friedman, Andrew Hughes, Aaron Walton, Daniel P O'Brien
Reported cases of Mycobacterium ulcerans disease (Buruli ulcer) have been increasing in southeastern Australia and spreading into new geographic areas. We analyzed 426 cases of M. ulcerans disease during January 1998-May 2017 in the established disease-endemic region of the Bellarine Peninsula and the emerging endemic region of the Mornington Peninsula. A total of 20.4% of cases-patients had severe disease. Over time, there has been an increase in the number of cases managed per year and the proportion associated with severe disease...
January 15, 2018: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28957473/assessment-of-health-care-workers-knowledge-attitude-and-risk-perception-of-buruli-ulcer-disease-in-southern-nigeria
#8
Ngozi Ekeke, Anthony O Meka, Joseph N Chukwu, Charles C Nwafor, Chukwuka Alphonsus, Obinna K Mbah, Nelson O Madichie, Ufuoma Aduh, Matthew Ogbeifo, Bola O IseOluwa-Adelokiki, Joseph E Edochie, Joseph Ushaka, Kingsley N Ukwaja
Background: Poor knowledge of health care workers may be responsible for the under-diagnosis and low notification of Buruli ulcer (BU) in high-burden settings. This study assessed health care workers' knowledge, attitude and risk perception of BU in Southern Nigeria. Methods: We conducted a cross-sectional survey among 186 health care workers recruited from 58 health facilities in four states of Southern Nigeria. A semi-structured interviewer-administered questionnaire was administered to all participants...
May 1, 2017: Transactions of the Royal Society of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28932250/evidences-of-the-low-implication-of-mosquitoes-in-the-transmission-of-mycobacterium-ulcerans-the-causative-agent-of-buruli-ulcer
#9
REVIEW
Rousseau Djouaka, Francis Zeukeng, Jude Daiga Bigoga, David N'golo Coulibaly, Genevieve Tchigossou, Romaric Akoton, Sylla Aboubacar, Sodjinin Jean-Eudes Tchebe, Clavella Nantcho Nguepdjo, Razack Adeoti, Innocent Djegbe, Manuele Tamo, Wilfred Fon Mbacham, Solange E Kakou-Ngazoa, Anthony Ablordey
BACKGROUND: Buruli ulcer (BU) continues to be a serious public health threat in wet tropical regions and the mode of transmission of its etiological agent, Mycobacterium ulcerans (MU), remains poorly understood. In this study, mosquito species collected in endemic villages in Benin were screened for the presence of MU. In addition, the ability of mosquitoes larvae to pick up MU from their environment and remain colonized through the larval developmental stages to the adult stage was investigated...
2017: Canadian Journal of Infectious Diseases & Medical Microbiology
https://www.readbyqxmd.com/read/28904608/the-chemistry-and-biology-of-mycolactones
#10
REVIEW
Matthias Gehringer, Karl-Heinz Altmann
Mycolactones are a group of macrolides excreted by the human pathogen Mycobacterium ulcerans, which exhibit cytotoxic, immunosuppressive and analgesic properties. As the virulence factor of M. ulcerans, mycolactones are central to the pathogenesis of the neglected disease Buruli ulcer, a chronic and debilitating medical condition characterized by necrotic skin ulcers. Due to their complex structure and fascinating biology, mycolactones have inspired various total synthesis endeavors and structure-activity relationship studies...
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28891259/mapping-biopsy-for-buruli-ulcer-self-medicated-with-occlusive-dressing
#11
Takuma Hayami, Toshifumi Takahashi, Takeshi Kato, Toshihiro Tanaka, Noriki Fujimoto
Buruli ulcer is the third most common mycobacterial infection next to tuberculosis and leprosy caused by Mycobacterium ulcerans. Although it affects the skin, subcutaneous tissues, muscles and sometimes bones, there is no reliable evidence to determine the extent of debridement. We present here a case of Buruli ulcer treated successfully with a preoperative mapping biopsy procedure, which had been self-medicated with occlusive dressing. Because Buruli ulcer is accompanied by subtle pain, patients and clinicians tend to initially treat the ulcer with occlusive dressing therapy, which leads to the misdiagnosis of Buruli ulcer as a common bacterial infection only judging from bacterial culture of the surface of the ulcer...
September 11, 2017: Journal of Dermatology
https://www.readbyqxmd.com/read/28873327/infiltrating-leukocytes-surround-early-buruli-ulcer-lesions-but-are-unable-to-reach-the-mycolactone-producing-mycobacteria
#12
Marie-Thérèse Ruf, Christina Steffen, Miriam Bolz, Peter Schmid, Gerd Pluschke
No abstract text is available yet for this article.
September 5, 2017: Virulence
https://www.readbyqxmd.com/read/28865696/-nursing-perspective-on-the-care-of-people-with-leprosy-in-ivory-coast
#13
Dan Lecocq
Lucien Gbadié is a nurse at the Raoul-Follereau Institute in Adzopé, Ivory Coast. In this article, he describes how people with leprosy or Buruli ulcer are treated and supported.
August 2017: Revue de L'infirmière
https://www.readbyqxmd.com/read/28821017/the-location-of-australian-buruli-ulcer-lesions-implications-for-unravelling-disease-transmission
#14
MULTICENTER STUDY
Arvind Yerramilli, Ee Laine Tay, Andrew J Stewardson, Peter G Kelley, Emma Bishop, Grant A Jenkin, Mike Starr, Janine Trevillyan, Andrew Hughes, N Deborah Friedman, Daniel P O'Brien, Paul D R Johnson
BACKGROUND: Buruli ulcer (BU), caused by Mycobacterium ulcerans, is increasing in incidence in Victoria, Australia. To improve understanding of disease transmission, we aimed to map the location of BU lesions on the human body. METHODS: Using notification data and clinical records review, we conducted a retrospective observational study of patients diagnosed with BU in Victoria from 1998-2015. We created electronic density maps of lesion locations using spatial analysis software and compared lesion distribution by age, gender, presence of multiple lesions and month of infection...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28783752/mycolactone-cytotoxicity-in-schwann-cells-could-explain-nerve-damage-in-buruli-ulcer
#15
Junichiro En, Sho Kitamoto, Akira Kawashima, Suguru Yonezawa, Yoshito Kishi, Norihisa Ishii, Masamichi Goto
Buruli ulcer is a chronic painless skin disease caused by Mycobacterium ulcerans. The local nerve damage induced by M. ulcerans invasion is similar to the nerve damage evoked by the injection of mycolactone in a Buruli ulcer mouse model. In order to elucidate the mechanism of this nerve damage, we tested and compared the cytotoxic effect of synthetic mycolactone A/B on cultured Schwann cells, fibroblasts and macrophages. Mycolactone induced much higher cell death and apoptosis in Schwann cell line SW10 than in fibroblast line L929...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28750103/bacterial-diversity-in-buruli-ulcer-skin-lesions-challenges-in-the-clinical-microbiome-analysis-of-a-skin-disease
#16
Chloé Van Leuvenhaege, Koen Vandelannoote, Dissou Affolabi, Françoise Portaels, Ghislain Sopoh, Bouke C de Jong, Miriam Eddyani, Conor J Meehan
BACKGROUND: Buruli ulcer (BU) is an infectious disease caused by Mycobacterium ulcerans and considered the third most prevalent mycobacterial disease in humans. Secondary bacterial infections in open BU lesions are the main cause of pain, delayed healing and systemic illness, resulting in prolonged hospital stay. Thus, understanding the diversity of bacteria, termed the microbiome, in these open lesions is important for proper treatment. However, adequately studying the human microbiome in a clinical setting can prove difficult when investigating a neglected tropical skin disease due to its rarity and the setting...
2017: PloS One
https://www.readbyqxmd.com/read/28749770/in-silico-prediction-of-antibiotic-resistance-in-mycobacterium-ulcerans-agy99-through-whole-genome-sequence-analysis
#17
Sushim Kumar Gupta, Michel Drancourt, Jean-Marc Rolain
Buruli ulcer is an emerging infectious disease caused by Mycobacterium ulcerans that has been reported from 33 countries. Antimicrobial agents either alone or in combination with surgery have been proved to be clinically relevant and therapeutic strategies have been deduced mainly from the empirical experience. The genome sequences of M. ulcerans strain AGY99, M. ulcerans ecovar liflandii, and three Mycobacterium marinum strains were analyzed to predict resistance in these bacteria. Fourteen putative antibiotic resistance genes from different antibiotics classes were predicted in M...
September 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28733024/ecohealth-research-in-africa-where-from-where-to
#18
EDITORIAL
Robert Bergquist, Norbert W Brattig, Moses J Chimbari, Jakob Zinsstag, Jürg Utzinger
Epidemiological mapping and risk profiling build on the idea that diseases are tied to social-ecological systems that govern the distribution and abundance of transmissible pathogens, vectors and hosts. This is the heart of the emerging field of ecohealth, which examines how biological, cultural, demographic, economic, physical, political and social environments change and how these changes affect the health and wellbeing of humans, animals and ecosystems and the services they provide. This paper is an overview of a special issue of Acta Tropica, whose 15 publications reflect a geographically and epidemiologically diverse landscape of ecohealth...
July 18, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28718822/a-bacterial-toxin-with-analgesic-properties-hyperpolarization-of-drg-neurons-by-mycolactone
#19
Ok-Ryul Song, Han-Byul Kim, Samuel Jouny, Isabelle Ricard, Alexandre Vandeputte, Nathalie Deboosere, Estelle Marion, Christophe J Queval, Pierre Lesport, Emmanuel Bourinet, Daniel Henrion, Seog Bae Oh, Guillaume Lebon, Guillaume Sandoz, Edouard Yeramian, Laurent Marsollier, Priscille Brodin
Mycolactone, a polyketide molecule produced by Mycobacterium ulcerans, is the etiological agent of Buruli ulcer. This lipid toxin is endowed with pleiotropic effects, presents cytotoxic effects at high doses, and notably plays a pivotal role in host response upon colonization by the bacillus. Most remarkably, mycolactone displays intriguing analgesic capabilities: the toxin suppresses or alleviates the pain of the skin lesions it inflicts. We demonstrated that the analgesic capability of mycolactone was not attributable to nerve damage, but instead resulted from the triggering of a cellular pathway targeting AT₂ receptors (angiotensin II type 2 receptors; AT₂R), and leading to potassium-dependent hyperpolarization...
July 18, 2017: Toxins
https://www.readbyqxmd.com/read/28671942/clearance-of-viable-mycobacterium-ulcerans-from-buruli-ulcer-lesions-during-antibiotic-treatment-as-determined-by-combined-16s-rrna-reverse-transcriptase-is-2404-qpcr-assay
#20
Mabel Sarpong-Duah, Michael Frimpong, Marcus Beissner, Malkin Saar, Ken Laing, Francisca Sarpong, Aloysius Dzigbordi Loglo, Kabiru Mohammed Abass, Margaret Frempong, Fred Stephen Sarfo, Gisela Bretzel, Mark Wansbrough-Jones, Richard Odame Phillips
INTRODUCTION: Buruli ulcer (BU) caused by Mycobacterium ulcerans is effectively treated with rifampicin and streptomycin for 8 weeks but some lesions take several months to heal. We have shown previously that some slowly healing lesions contain mycolactone suggesting continuing infection after antibiotic therapy. Now we have determined how rapidly combined M. ulcerans 16S rRNA reverse transcriptase / IS2404 qPCR assay (16S rRNA) became negative during antibiotic treatment and investigated its influence on healing...
July 2017: PLoS Neglected Tropical Diseases
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