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Buruli Ulcer

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https://www.readbyqxmd.com/read/28980523/increased-severity-and-spread-of-mycobacterium-ulcerans-southeastern-australia
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
https://www.readbyqxmd.com/read/28500810/environmental-and-behavioral-drivers-of-buruli-ulcer-disease-in-selected-communities-along-the-densu-river-basin-of-ghana-a-case-control-study
#15
Samuel Yaw Aboagye, Prince Asare, Isaac Darko Otchere, Eric Koka, George Ekow Mensah, Dzidzo Yirenya-Tawiah, Dorothy Yeboah-Manu
AbstractThe exact route of transmission of Mycobacterium ulcerans (MU) (causative agent of Buruli ulcer [BU]), risk factors, and reservoir hosts are not clearly known, although it has been identified as an environmental pathogen. This study assessed potential environmental and behavioral risk factors that influence BU infections. We conducted a case-control study where cases were matched by their demographic characteristics and place of residence. A structured questionnaire was administered to solicit information on the environmental and behavioral factors of participants that may expose them to infection...
May 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28487559/global-and-local-environmental-changes-as-drivers-of-buruli-ulcer-emergence
#16
Marine Combe, Camilla Jensen Velvin, Aaron Morris, Andres Garchitorena, Kevin Carolan, Daniel Sanhueza, Benjamin Roche, Pierre Couppié, Jean-François Guégan, Rodolphe Elie Gozlan
No abstract text is available yet for this article.
May 10, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28481900/yaws-resurgence-in-bankim-cameroon-the-relative-effectiveness-of-different-means-of-detection-in-rural-communities
#17
Alphonse Um Boock, Paschal Kum Awah, Ferdinand Mou, Mark Nichter
BACKGROUND: Yaws is an infectious, debilitating and disfiguring disease of poverty that mainly affects children in rural communities in tropical areas. In Cameroon, mass-treatment campaigns carried out in the 1950s reduced yaws to such low levels that it was presumed the disease was eradicated. In 2010, an epidemiological study in Bankim Health District detected 29 cases of yaws. Five different means of detecting yaws in clinical and community settings were initiated in Bankim over the following five years...
May 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28450515/draft-genome-sequence-of-mycobacterium-ulcerans-s4018-isolated-from-a-patient-with-an-active-buruli-ulcer-in-benin-africa
#18
Stanimir Kambarev, Stéphane Corvec, Annick Chauty, Estelle Marion, Laurent Marsollier, Frédéric Pecorari
Currently, there are only two publicly available genomes of Mycobacterium ulcerans-the causative agent of the neglected, but devastating, tropical disease Buruli ulcer. Here, we report the draft genome sequence of isolate S4018, recovered from an active cutaneous lesion of a patient with Buruli ulcer in Benin, Africa.
April 27, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28442755/global-and-local-environmental-changes-as-drivers-of-buruli-ulcer-emergence
#19
REVIEW
Marine Combe, Camilla Jensen Velvin, Aaron Morris, Andres Garchitorena, Kevin Carolan, Daniel Sanhueza, Benjamin Roche, Pierre Couppié, Jean-François Guégan, Rodolphe Elie Gozlan
Many emerging infectious diseases are caused by generalist pathogens that infect and transmit via multiple host species with multiple dissemination routes, thus confounding the understanding of pathogen transmission pathways from wildlife reservoirs to humans. The emergence of these pathogens in human populations has frequently been associated with global changes, such as socio-economic, climate or biodiversity modifications, by allowing generalist pathogens to invade and persist in new ecological niches, infect new host species, and thus change the nature of transmission pathways...
April 26, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28442219/virulence-potential-of-staphylococcus-aureus-isolates-from-buruli-ulcer-patients
#20
Nana Ama Amissah, Monika A Chlebowicz, Anthony Ablordey, Caitlin S Tetteh, Isaac Prah, Tjip S van der Werf, Alex W Friedrich, Jan Maarten van Dijl, Ymkje Stienstra, John W Rossen
Buruli ulcer (BU) is a necrotizing infection of the skin and subcutaneous tissue caused by Mycobacterium ulcerans. BU wounds may also be colonized with other microorganisms including Staphylococcus aureus. This study aimed to characterize the virulence factors of S. aureus isolated from BU patients. Previously sequenced genomes of 21 S. aureus isolates from BU patients were screened for the presence of virulence genes. The results show that all S. aureus isolates harbored on their core genomes genes for known virulence factors like α-hemolysin, and the α- and β-phenol soluble modulins...
June 2017: International Journal of Medical Microbiology: IJMM
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