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Nontuberculous mycobacteria

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https://www.readbyqxmd.com/read/28521627/disseminated-bacillus-calmette-gu%C3%A3-rin-osteomyelitis-in-twin-sisters-related-to-stat1-gene-deficiency
#1
Sabah Boudjemaa, Linda Dainese, Sébastien Héritier, Caroline Masserot, Samia Hachemane, Jean-Laurent Casanova, Aurore Coulomb, Jacinta Bustamante
Mendelian susceptibility to mycobacterial disease is a rare syndrome characterized by severe clinical infections usually caused by weakly virulent mycobacterial species such as Bacillus Calmette-Guérin vaccines and environmental nontuberculous mycobacteria or more virulent mycobacteria as mycobacterium tuberculosis. Since 1996, 9 genes including 7 autosomal ( STAT1, IFNGR1, IFNGR2, IL12B, IL12RB1, ISG15, and IRF8) and 2 X-linked genes ( NEMO and CYBB) have been identified. Allelic heterogeneity leaded to recognize about 18 genetic diseases with variable clinical phenotypes, but sharing a same physiological mechanism represented by a defect in human IL-12-dependant-INF-γ-mediated immunity...
June 2017: Pediatric and Developmental Pathology
https://www.readbyqxmd.com/read/28504926/accurate-differentiation-of-mycobacterium-chimaera-from-mycobacterium-intracellulare-by-maldi-tof-ms-analysis
#2
Arthur B Pranada, Ellen Witt, Michael Bienia, Markus Kostrzewa, Markus Timke
PURPOSE: The increasing number of infections caused by nontuberculous mycobacteria (NTM) has prompted the need for rapid and precise identification methods of these pathogens. Several studies report the applicability of MALDI-TOF mass spectrometry (MS) for identification of NTM. However, some closely related species have very similar spectral mass fingerprints, and until recently, Mycobacterium chimaera and M. intracellulare could not be separated from each other by MALDI-TOF MS. METHODOLOGY: The conventional identification methods used in routine diagnostics have similar limitations...
May 15, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28483608/safety-and-effectiveness-of-clofazimine-for-primary-and-refractory-nontuberculous-mycobacterial-infection
#3
Stacey L Martiniano, Brandie D Wagner, Adrah Levin, Jerry A Nick, Scott D Sagel, Charles L Daley
BACKGROUND: Clofazimine is an antimicrobial agent that has activity in vitro against mycobacteria. Increasingly, it has been used for the treatment of nontuberculous mycobacteria (NTM), despite limited data supporting use in this setting. The objective of this study was to evaluate safety, tolerability, and clinical outcomes associated with clofazimine in patients with NTM infection. METHODS: Observational-cohort study of clofazimine used for pediatric and adult cystic fibrosis (CF) and non-CF patients with pulmonary and extrapulmonary NTM infection as part of a multidrug regimen from 2006-2014...
May 5, 2017: Chest
https://www.readbyqxmd.com/read/28480547/impact-of-updating-the-maldi-tof-ms-database-on-the-identification-of-nontuberculous-mycobacteria
#4
David Rodriguez-Temporal, Daniel Perez-Risco, Eduardo A Struzka, Mireia Mas, Fernando Alcaide
Conventional identification of mycobacteria species is slow, laborious and has low discriminatory power. MALDI-TOF MS has proved highly effective for identifying conventional bacteria, and it may also be useful for identifying mycobacteria. The aim of this study was to evaluate and compare MALDI-TOF MS with currently recommended molecular methods for the identification of nontuberculous mycobacteria (NTM), applying Mycobacteria Libraries v3.0 (ML3.0) and v2.0 (ML2.0). A total of 240 clinical isolates of 41 NTM species grown on solid media were analysed: 132 isolates of slow-growing mycobacteria and 108 of rapid-growing mycobacteria...
May 8, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28475796/real-life-clinical-practice-of-using-the-xpert-mtb-rif-assay-in-thailand
#5
Kamon Kawkitinarong, Gompol Suwanpimolkul, Pairaj Kateruttanakul, Weerawat Manosuthi, Sasiwimol Ubolyam, Jiratchaya Sophonphan, Anchalee Avihingsanon, Kiat Ruxrungtham
Background: Delayed diagnosis of tuberculosis (TB) and drug-resistant TB are major challenges of TB control in Thailand. This study assessed the practicality of the Xpert MTB/RIF assay in a real-life setting with high prevalence of human immunodeficiency virus (HIV) infection and pulmonary tuberculosis (PTB). Methods: This prospective study was conducted at 3 large tertiary care hospitals. Patients who had suspected PTB were enrolled into the study. Expectorated sputum samples were sent for staining, mycobacterial culture, and Xpert MTB/RIF...
May 15, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28462746/disinfectant-susceptibility-profiling-of-glutaraldehyde-resistant-nontuberculous-mycobacteria
#6
Winona Burgess, Alyssa Margolis, Sara Gibbs, Rafael Silva Duarte, Mary Jackson
OBJECTIVE Activated alkaline glutaraldehyde (GTA) remains one of the most widely used high-level disinfectants worldwide. However, several reports have highlighted the potential for nontuberculous mycobacteria to develop high-level resistance to this product. Because aldehyde resistance may lead to cross-resistance to other biocides, we investigated the susceptibility profile of GTA-resistant Mycobacterium chelonae and M. abscessus isolates to various disinfectant chemistries. METHODS High-level disinfectants commonly used in the reprocessing of endoscopes and other heat-sensitive, semicritical medical equipment, including different formulations of aldehyde-based products and oxidizing agents, were tested against 10 slow- and fast-growing, GTA-susceptible and GTA-resistant, Mycobacterium isolates in suspension tests and carrier tests at different temperatures...
May 2, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/28459317/what-is-nontuberculous-mycobacteria-ntm-disease
#7
(no author information available yet)
No abstract text is available yet for this article.
May 1, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28436419/nontuberculous-mycobacteria-in-gastrostomy-fed-patients-with-cystic-fibrosis
#8
H Al-Momani, A Perry, R Jones, S Bourke, S Doe, J Perry, A Anderson, T Forrest, I Forrest, M Griffin, M Brodlie, J Pearson, C Ward
Multi-drug resistant Mycobacterium abscessus complex (MABSC) is a form of Nontuberculous mycobacteria (NTM) of special, international concern in Cystic Fibrosis (CF). We hypothesised that gastric juice and percutaneous endoscopic gastrostomy (PEG) feeding devices might yield MABSC isolates. Gastric juice and sputa from sixteen adult PEG fed CF patients and five replaced PEG tubes were studied. Bacterial and fungal isolates were cultured. Mycobacterium were identified by rpoB, sodA and hsp65 gene sequencing and strain typed using variable number tandem repeat...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28422568/cgas-sting-tbk1-irf3-7-induced-interferon-%C3%AE-contributes-to-the-clearing-of-non-tuberculous-mycobacterial-infection-in-mice
#9
Nanthapon Ruangkiattikul, Andreas Nerlich, Ketema Abdissa, Stefan Lienenklaus, Abdulhadi Suwandi, Nina Janze, Kristin Laarmann, Julia Spanier, Ulrich Kalinke, Siegfried Weiss, Ralph Goethe
Type I interferons (IFN-I), such as IFN-α and IFN-β are important messengers in the host response against bacterial infections. Knowledge about the role of IFN-I in infections by nontuberculous mycobacteria (NTM) is limited. Here we show that macrophages infected with pathogens of the Mycobacterium avium complex produced significantly lower amounts of IFN-β than macrophages infected with the opportunistic pathogen M. smegmatis. To dissect the molecular mechanisms of this phenomenon, we focused on the obligate pathogen Mycobacterium avium ssp paratuberculosis (MAP) and the opportunistic M...
April 19, 2017: Virulence
https://www.readbyqxmd.com/read/28418290/invasive-nontuberculous-mycobacterial-infections-among-cardiothoracic-surgical-patients-exposed-to-heater-cooler-devices-1
#10
Meghan M Lyman, Cheri Grigg, Cara Bicking Kinsey, M Shannon Keckler, Heather Moulton-Meissner, Emily Cooper, Minn M Soe, Judith Noble-Wang, Allison Longenberger, Shane R Walker, Jeffrey R Miller, Joseph F Perz, Kiran M Perkins
Invasive nontuberculous mycobacteria (NTM) infections may result from a previously unrecognized source of transmission, heater-cooler devices (HCDs) used during cardiac surgery. In July 2015, the Pennsylvania Department of Health notified the Centers for Disease Control and Prevention (CDC) about a cluster of NTM infections among cardiothoracic surgical patients at 1 hospital. We conducted a case-control study to identify exposures causing infection, examining 11 case-patients and 48 control-patients. Eight (73%) case-patients had a clinical specimen identified as Mycobacterium avium complex (MAC)...
May 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28406709/long-term-outcomes-in-a-population-based-cohort-with-respiratory-nontuberculous-mycobacteria-isolation
#11
Emily Henkle, Shannon A Novosad, Sean Shafer, Katrina Hedberg, Sarah A R Siegel, Jennifer Ku, Cara Varley, D Rebecca Prevots, Theodore K Marras, Kevin L Winthrop
RATIONALE: The natural history of nontuberculous mycobacterial (NTM) respiratory infection within the general population is poorly understood. OBJECTIVES: To describe the long-term clinical, microbiologic, and radiographic outcomes of patients with respiratory NTM isolates. METHODS: We previously identified a population-based cohort of patients with respiratory NTM isolation during 2005-6, and categorized patients as cases or non-cases using the ATS/IDSA pulmonary NTM disease criteria at that time...
April 13, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28400668/nontuberculous-mycobacterial-infection-of-the-musculoskeletal-system-in-immunocompetent-hosts
#12
Manit K Gundavda, Hitendra G Patil, Vikas M Agashe, Rajeev Soman, Camilla Rodriques, Ramesh B Deshpande
BACKGROUND: Nontuberculous mycobacteria (NTM) were considered saprophytic organisms for many years but now are recognized as human pathogens. Although humans are routinely exposed to NTM, the rate of clinical infection is low. Such infections usually occur in the elderly and in patients who are immunocompromised. However, there has been an increasing incidence in recent years of infections in immunocompetent hosts. NTM infections in immunocompetent individuals are secondary to direct inoculation either contamination from surgical procedures or penetrating injuries rather than hematogenous dissemination...
March 2017: Indian Journal of Orthopaedics
https://www.readbyqxmd.com/read/28393860/mycobacterium-llatzerense-a-waterborne-mycobacterium-that-resists-phagocytosis-by-acanthamoeba-castellanii
#13
Vincent Delafont, Ascel Samba-Louaka, Emmanuelle Cambau, Didier Bouchon, Laurent Moulin, Yann Héchard
Nontuberculous mycobacteria (NTM) are environmental bacteria increasingly associated to public health problems. In water systems, free-living amoebae (FLA) feed on bacteria by phagocytosis, but several bacteria, including many NTM, are resistant to this predation. Thus, FLA can be seen as a training ground for pathogenic bacteria. Mycobacterium llatzerense was previously described as frequently associated with FLA in a drinking water network. The present study aimed to characterize the interactions between M...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28392413/isolation-and-identification-of-multiple-drug-resistant-nontuberculous-mycobacteria-from-organs-of-cattle-produced-typical-granuloma-lesions
#14
Guangyu Cheng, Donglei Xu, Jinling Wang, Chunfa Liu, Yang Zhou, Yongyong Cui, Hancan Liu, Kanglin Wan, Xiangmei Zhou
Nontuberculosis mycobacteria are widespread in the environment and some are zoonotic. 320 tissue samples with visible lesions were obtained from dairy cows and examined by histopathology. Eleven samples showed typical granulomatous lesions and a total of 8 strains were cultured. Three genes (16S rRNA, hsp65 and rpoB) were sequenced for species identification. All mycobacterial isolates were tested for rifampicin, isoniazid, ethambutol, streptomycin, capreomycin, kanamycin, para-aminosalicylic acid susceptibility...
April 6, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28387532/mortality-after-respiratory-isolation-of-nontuberculous-mycobacteria-a-comparison-of-patients-who-did-and-did-not-meet-disease-criteria
#15
Shannon A Novosad, Emily Henkle, Sean Schafer, Katrina Hedberg, Jennifer Ku, Sarah A R Siegel, Dongseok Choi, Christopher G Slatore, Kevin L Winthrop
RATIONALE: The mortality of patients with respiratory tract isolates of nontuberculous mycobacteria (NTM) and their risk factors for death are not well described . OBJECTIVES: This study had two objectives: 1) to determine age-adjusted mortality rates for patients with respiratory NTM isolates and their causes of death; and 2) to examine whether ATS/IDSA diagnostic criteria identify those at higher risk of death after NTM isolation. METHODS: We linked vital records registries with a previously identified Oregon populationbased cohort of patients with NTM respiratory isolation...
April 7, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28387523/species-specific-risk-factors-treatment-decisions-and-clinical-outcomes-for-laboratory-isolates-of-less-common-nontuberculous-mycobacteria-in-washington-state
#16
Emily S Ford, David J Horne, Javeed A Shah, Carolyn K Wallis, Ferric C Fang, Thomas R Hawn
RATIONALE: Nontuberculous mycobacteria are a diverse group of environmental organisms that infrequently cause human disease. Understanding the epidemiologic and clinical characteristics associated with nontuberculous mycobacterial disease is needed to refine diagnostic and treatment strategies, particularly among the less commonly isolated species. OBJECTIVES: To improve knowledge of geographic variance of nontuberculous mycobacteria (NTM) species, to correlate detailed clinical information with isolation of specific NTM, and to examine the decision to treat and outcomes for specific NTM...
April 7, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28387180/mycobacterium-marinum
#17
Alexandra Aubry, Faiza Mougari, Florence Reibel, Emmanuelle Cambau
Mycobacterium marinum is a well-known pathogenic mycobacterium for skin and soft tissue infections and is associated with fishes and water. Among nontuberculous mycobacteria (NTM), it is the leading cause of extrarespiratory human infections worldwide. In addition, there is a specific scientific interest in M. marinum because of its genetic relatedness to Mycobacterium tuberculosis and because experimental infection of M. marinum in fishes mimics tuberculosis pathogenesis. Microbiological characteristics include the fact that it grows in 7 to 14 days with photochromogenic colonies and is difficult to differentiate from Mycobacterium ulcerans and other mycolactone-producing NTM on a molecular basis...
April 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28381605/nontuberculous-mycobacteria-in-greenland-novel-epidemiological-insights-from-a-tb-high-incidence-setting
#18
Thomas S Hermansen, Allan Gelvan, Troels Lillebaek
The diverse group of nontuberculous mycobacteria (NTM) are ubiquitous organisms found in the environment worldwide (1-3).….
April 5, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28350331/novel-sulfamethoxazole-ureas-and-oxalamide-as-potential-antimycobacterial-agents
#19
Martin Krátký, Jiřina Stolaříková, Jarmila Vinšová
Infections caused by Mycobacterium tuberculosis (Mtb.) and nontuberculous mycobacteria (NTM) are considered to be a global health problem; current therapeutic options are limited. Sulfonamides have exhibited a wide range of biological activities including those against mycobacteria. Based on the activity of 4-(3-heptylureido)-N-(5-methylisoxazol-3-yl)benzenesulfonamide against NTM, we designed a series of homologous sulfamethoxazole-based n-alkyl ureas (C₁-C12), as well as several related ureas and an oxalamide...
March 28, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28348502/nontuberculous-mycobacteria-in-saudi-arabia-and-gulf-countries-a-review
#20
REVIEW
Hawra Al-Ghafli, Sahal Al-Hajoj
Nontuberculous Mycobacteria (NTM) are causing growing health problems worldwide. This is indicated by an increasing amount of scientific reports showing not only well-identified species reemerging but also emergence of new species. The emergence and reemergence of NTM are particularly worrying in developing countries due to scarce published data and improper identification. Here we aimed to examine the main epidemiological aspects and diagnostic challenges associated with NTM in countries of the Gulf Cooperation Council (GCC) and compare these findings to the international arena findings...
2017: Canadian Respiratory Journal: Journal of the Canadian Thoracic Society
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