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Mycobacterium avium complex

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https://www.readbyqxmd.com/read/28433210/non-tuberculous-mycobacteria-an-emerging-threat
#1
Susana Martínez González, Arantxa Cano Cortés, Luis Alfonso Sota Yoldi, José María García García, Luz María Alba Álvarez, Juan José Palacios Gutiérrez
INTRODUCTION AND OBJECTIVE: Non-tuberculous mycobacteria (NTM) isolates are becoming more common. The main objective of our study was to establish the number and diversity of NTM species in our region and their distribution according to the source sample, age and gender of the patients, and to analyse clinically significant isolates. METHODOLOGY: Prospective study of all NTM isolated in Asturias from 2005 to 2012. Samples were processed following internationally accepted guidelines...
April 19, 2017: Archivos de Bronconeumología
https://www.readbyqxmd.com/read/28429679/mycobacterium-avium-complex-disease
#2
Charles L Daley
Despite the ubiqitous nature of Mycobacterium avium complex (MAC) organisms in the environment, relatively few of those who are infected develop disease. Thus, some degree of susceptibility due to either underlying lung disease or immunosuppression is required. The frequency of pulmonary MAC disease is increasing in many areas, and the exact reasons are unknown. Isolation of MAC from a respiratory specimen does not necessarily mean that treatment is required, as the decision to treatment requires the synthesis of clinical, radiographic, and microbiologic information as well as a weighing of the risks and benefits for the individual patient...
April 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28427555/impact-of-cavity-and-infiltration-on-pulmonary-function-and-health-related-quality-of-life-in-pulmonary-mycobacterium-avium-complex-disease-a-3-dimensional-computed-tomographic-analysis
#3
Takanori Asakura, Yoshitake Yamada, Ho Namkoong, Shoji Suzuki, Yuki Niijima, Hirofumi Kamata, Yohei Funatsu, Kazuma Yagi, Satoshi Okamori, Hiroaki Sugiura, Makoto Ishii, Masahiro Jinzaki, Tomoko Betsuyaku, Naoki Hasegawa
BACKGROUND AND OBJECTIVES: Pulmonary Mycobacterium avium complex (pMAC) disease manifests as various types of lesions, such as infiltrates, nodules, cavities, and bronchiectasis. However, the important determinants for clinical parameters in lung involvement are poorly understood. The objective of this study was to obtain quantitative parameters by 3-dimensional CT, and investigate the relationship between these parameters and the pulmonary function tests (PFTs) and health-related quality of life...
May 2017: Respiratory Medicine
https://www.readbyqxmd.com/read/28423094/complications-of-chronic-necrotizing-pulmonary-aspergillosis-review-of-published-case-reports
#4
Aleksandra Barac, Tatjana Adzic Vukicevic, Aleksandra Dudvarski Ilic, Salvatore Rubino, Vladimir Zugic, Goran Stevanovic
Chronic necrotizing pulmonary aspergillosis (CNPA), a form of chronic pulmonary aspergillosis (CPA), affects immunocompetent or mildly immunocompromised persons with underlying pulmonary disease. These conditions are associated with high morbidity and mortality and often require long-term antifungal treatment. The long-term prognosis for patients with CNPA and the potential complications of CNPA have not been well documented. The aim of this study was to review published papers that report cases of CNPA complications and to highlight risk factors for development of CNPA...
April 13, 2017: Revista do Instituto de Medicina Tropical de São Paulo
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
#5
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 focussed on the obligate pathogen Mycobacterium avium ssp...
April 19, 2017: Virulence
https://www.readbyqxmd.com/read/28418290/invasive-nontuberculous-mycobacterial-infections-among-cardiothoracic-surgical-patients-exposed-to-heater-cooler-devices-1
#6
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/28416214/corrigendum-to-nothing-to-s-cough-at-pulmonary-mycobacterium-avium-complex-infection-am-j-med-2017-130-2-153-156
#7
Michael A Santos, Hardikkumar Patel, Adam Albert
No abstract text is available yet for this article.
April 14, 2017: American Journal of Medicine
https://www.readbyqxmd.com/read/28413773/a-m-%C3%A2-avium-complex-spondylodiscitis-in-a-middle-aged-woman-with-diabetes
#8
Irini Gerogianni, Stylianos Boutlas, Theophilos Karachalios, Eythymia Petinaki, Marianna Vlychou, K I Gourgoulianis
Spondylodiscitis, the inflammation of the vertebral bodies and the intervertebral disk space, is the reason for low back pain in a minority of cases. This is caused by various pathogens. Mycobacterium tuberculosis is responsible for 17-39% of all the cases of spondylodiscitis. On the contrast, spondylodiscitis from non tuberculous mycobacteria is extremely rare in literature. We describe a 68 -year old diabetic woman which is the first case of bone marrow involvement by M. intracellulare (member of M avium complex)with spondylodiscitis...
2017: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/28399124/dual-color-fluorescence-in-situ-hybridization-fish-assays-for-detecting-mycobacterium-tuberculosis-and-mycobacterium-avium-complexes-and-related-pathogens-in-cultures
#9
Jyotsna Shah, Helena Weltman, Patricia Narciso, Christina Murphy, Akhila Poruri, Shrikala Baliga, Leesha Sharon, Mary York, Gail Cunningham, Steve Miller, Luz Caviedes, Robert Gilman, Edward Desmond, Ranjan Ramasamy
Two rapid dual color fluorescence in situ hybridization (FISH) assays were evaluated for detecting M. tuberculosis and related pathogens in cultures. The MN Genus-MTBC FISH assay uses an orange fluorescent probe specific for the Mycobacterium tuberculosis complex (MTBC) and a green fluorescent probe specific for the Mycobacterium and Nocardia genera (MN Genus) to detect and distinguish MTBC from other Mycobacteria and Nocardia. A complementary MTBC-MAC FISH assay uses green and orange fluorescent probes specific for the MTBC and M...
2017: PloS One
https://www.readbyqxmd.com/read/28390237/methodological-approaches-for-monitoring-opportunistic-pathogens-in-premise-plumbing-a-review
#10
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...
March 25, 2017: Water Research
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
#11
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/28367886/changes-in-serum-iga-antibody-levels-against-the-glycopeptidolipid-core-antigen-during-antibiotic-treatment-of-mycobacterium-avium-complex-lung-disease
#12
Byung Woo Jhun, Su-Young Kim, Hye Yun Park, Kyeongman Jeon, Sung Jae Shin, Won-Jung Koh
We evaluated serial changes in the levels of serum immunoglobulin A (IgA) antibody to the glycopeptidolipid (GPL) core antigen during antibiotic treatment in 57 patients with M. avium complex (MAC) lung disease, at baseline (T0) and after 3 months (T3) and 6 months (T6) of treatment. The median patient age was 59 years and 37 (65%) were female. Etiologic organisms included M. avium in 32 (56%) patients and M. intracellulare in 25 (44%). Seven (12%) patients had the fibrocavitary form of the disease on computed tomography...
March 28, 2017: Japanese Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28356415/evaluation-of-the-genotype-ntm-dr-assay-for-identification-of-mycobacterium-chimaera
#13
Simone Mok, Thomas R Rogers, Margaret Fitzgibbon
Identification of species within the Mycobacterium avium Complex (MAC) is difficult and most current diagnostic laboratory tests cannot distinguish between species included in the complex. Differentiation of species within the MAC is important as Mycobacterium chimaera has recently emerged as major cause of invasive cardiovascular infections following open heart surgery. A new commercial diagnostic assay, GenoType NTM-DR ver. 1.0, is intended to differentiate between three species within the MAC, namely Mycobacterium avium, Mycobacterium intracellulare and Mycobacterium chimaera In this study we investigated an archival collection of 173 MAC isolates using 16S rRNA and 16S-23S ITS gene sequencing, and the GenoType NTM-DR was evaluated for identifying M...
March 29, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28333340/evaluation-of-the-new-genotype-ntm-dr-kit-for-the-molecular-detection-of-antimicrobial-resistance-in-non-tuberculous-mycobacteria
#14
Faiza Mougari, Jade Loiseau, Nicolas Veziris, Christine Bernard, Béatrice Bercot, Wladimir Sougakoff, Vincent Jarlier, Laurent Raskine, Emmanuelle Cambau
Objectives: Non-tuberculous mycobacteria (NTM) are emerging pathogens causing difficult-to-treat infections. We tested a new assay (GenoType NTM-DR) that detects natural and acquired resistance mechanisms to macrolides and aminoglycosides in frequently isolated NTM species. Methods: Performance was assessed on 102 isolates including reference strains [16 Mycobacterium avium , 10 Mycobacterium intracellulare , 8 Mycobacterium chimaera , 15 Mycobacterium chelonae and 53 Mycobacterium abscessus (including subsp...
February 28, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28330892/in-vitro-susceptibility-testing-of-tedizolid-against-nontuberculous-mycobacteria
#15
Barbara A Brown-Elliott, Richard J Wallace
Tedizolid is a new oxazolidinone with improved in vitro and intracellular potency against Mycobacterium tuberculosis, including multidrug resistant strains, and some species of nontuberculous mycobacteria (NTM) compared with linezolid.Using the current Clinical and Laboratory Standards Institute (CLSI) recommended method of broth microdilution, susceptibility testing of 170 isolates of rapidly growing mycobacteria showed equivalent or lower (1- to 8-fold MIC50 and/or MIC90 values) for tedizolid compared to linezolid...
March 22, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28326308/infection-sources-of-a-common-non-tuberculous-mycobacterial-pathogen-mycobacterium-avium-complex
#16
REVIEW
Yukiko Nishiuchi, Tomotada Iwamoto, Fumito Maruyama
Numerous studies have revealed a continuous increase in the worldwide incidence and prevalence of non-tuberculous mycobacteria (NTM) diseases, especially pulmonary Mycobacterium avium complex (MAC) diseases. Although it is not clear why NTM diseases have been increasing, one possibility is an increase of mycobacterial infection sources in the environment. Thus, in this review, we focused on the infection sources of pathogenic NTM, especially MAC. The environmental niches for MAC include water, soil, and dust...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/28317808/isolation-and-characterization-of-nontuberculous-mycobacteria-from-patients-with-pulmonary-tuberculosis-in-ghana
#17
Isaac Darko Otchere, Adwoa Asante-Poku, Stephen Osei-Wusu, Samuel Yaw Aboagye, Dorothy Yeboah-Manu
OBJECTIVE/BACKGROUND: Nontuberculous mycobacterial (NTM) species are assuming public health importance in pulmonary diseases; they are increasingly being isolated, and importantly, most NTMs do not respond to routine tuberculosis (TB) drugs. This study aimed to identify NTMs isolated from pulmonary TB cases and also determine their susceptibility to streptomycin (STR), isoniazid (INH), and rifampicin (RIF). METHODS: A total of 1755 mycobacterial isolates, obtained between August 2012 and July 2014, from 2036 smear-positive pulmonary cases were identified using polymerase chain reaction amplification of IS6110, and hsp65 gene sequencing analysis...
January 2017: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28291631/distribution-and-clinical-significance-of-mycobacterium-avium-complex-species-isolated-from-respiratory-specimens
#18
Su-Young Kim, Sun Hye Shin, Seong Mi Moon, Bumhee Yang, Hojoong Kim, O Jung Kwon, Hee Jae Huh, Chang-Seok Ki, Nam Yong Lee, Sung Jae Shin, Won-Jung Koh
Mycobacterium avium complex (MAC) was originally composed of 2 species, M. avium and M. intracellulare. However, several new species closely related to M. intracellulare have recently been identified. In addition, M. avium has been further subdivided into 4 subspecies. The aim of this study was to determine the proportion of different MAC species recovered from respiratory specimens and to elucidate the clinical relevance of these species. Clinical isolates, from 219 patients, that had been initially identified as M...
March 2, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28290221/microbiological-diagnosis-and-antimicrobial-sensitivity-profiles-in-diseased-free-living-raptors
#19
Anna Vidal, Laia Baldomà, Rafael A Molina-Lopez, Marga Martin, Laila Darwich
Free-living raptors (birds of prey) can act as reservoirs of potentially zoonotic agents but they also can be affected by microorganisms as target hosts. In this retrospective study, microbiological results (n=663) and antibiotic sensitivity profiles (n=108) of bacterial isolates were analyzed from diseased free-living raptors. Sixty-nine percent of cases (n=457) yielded bacteria: 58% were in pure culture and 42% were of different species. Remarkably, samples from necropsies (47%) had higher percentage of pure isolations than those obtained from clinical (31%) samples (p<0...
March 14, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28284662/effect-of-a-150%C3%A2-mg-dose-of-rifabutin-on-serum-itraconazole-levels-in-patients-with-coexisting-chronic-pulmonary-aspergillosis-and-mycobacterium-avium-complex-lung-disease
#20
Seong Mi Moon, Byung Woo Jhun, Hyun Lee, Hye Yun Park, Kyeongman Jeon, Soo-Youn Lee, Won-Jung Koh
Patients with coexisting chronic pulmonary aspergillosis and nontuberculous mycobacterial lung disease may undergo treatment with both the antifungal itraconazole and the antimycobacterial rifamycin. However, rifamycins interact with itraconazole. We examined the effects of a 150 mg dose of rifabutin on serum itraconazole levels and found significantly lower levels in 28 patients receiving itraconazole with rifabutin (median, 0.65 μg/ml) compared with 65 patients receiving itraconazole alone (median 3.45 μg/ml, P < 0...
March 8, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
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